|An approximate reconstruction of a Neanderthal skeleton. The central rib cage, including the sternum, and parts of the pelvis are from modern humans.|
|Known Neanderthal range in Europe (blue), Southwest Asia (orange), Uzbekistan (green), and the Altai Mountains (violet).|
Neanderthals (/ -, - /,, also Neandertals or Neandert(h)alers, German: Neandertaler [neˈ(ʔ)andɐtaːlɐ]; Homo neanderthalensis or Homo sapiens neanderthalensis) are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago (40 kya [thousand years ago]). They probably went extinct due to competition with or extermination by immigrating modern humans or due to great climatic change, disease, or a combination of these factors.
It is unclear when Neanderthals split from modern humans; DNA studies have produced results ranging from 182 kya to more than 800 kya. The time of divergence of Neanderthals from their ancestor H. heidelbergensis is also unclear. The oldest potential Neanderthal bones are dated to 430 kya, but the classification is uncertain. Neanderthals are known from numerous fossils, especially from after 130 kya. The type specimen, Neanderthal 1, was found in 1856 in the German Neander Valley. After much debate over their validity, Neanderthals were depicted as being primitive, stupid, and brutish for much of the early 20th century. Though knowledge and perception of them has markedly changed since then in the scientific community, the image of the unevolved caveman archetype remains prevalent in popular culture.
Neanderthal technology is thought to have been quite sophisticated. It includes the Mousterian stone tool industry and the abilities to create fire and build cave hearths, make the adhesive birch bark tar, craft at least simple clothes similar to blankets and ponchos, weave, go seafaring through the Mediterranean, make use of medicinal plants as well as treat severe injuries, and use various cooking techniques, such as roasting and smoking. Neanderthals made use of a wide array of food, mainly hoofed mammals, but also other megafauna, plants, small mammals, birds, and aquatic and marine resources. Though they were likely apex predators, they still competed with cave bears, cave lions, cave hyaenas, and other large predators.:120–143 A few examples of Paleolithic art have been controversially attributed to Neanderthals, most famously Spanish cave paintings contentiously dated to before 65 kya and the Divje Babe Flute. Some claims of religious beliefs have been made. Neanderthals were capable of speech, though it is unclear how complex their language was.
Compared to modern humans, Neanderthals were stockier, with somewhat shorter limbs and a larger chest. These features are often explained as adaptations to conserve heat in a cold climate, but may also be adaptations for sprinting in the warmer, forested landscape that Neanderthals often inhabited. Nonetheless, they had cold-specific adaptations, such as specialised body fat storage and an enlarged nose to warm air (though the nose could have been caused by genetic drift). Average Neanderthal men stood around 165 cm (5 ft 5 in) and women 153 cm (5 ft) tall, similar to contemporary humans. The braincases of Neanderthal men and women averaged about 1,600 cm3 (98 cu in) and 1,300 cm3 (79 cu in) respectively, which is within the range of the values for modern humans.
The total population remained low, and they lived in small groups, interacting rarely with outsiders. This led to inbreeding and inbreeding depression with the accumulation of harmful genes. Neanderthals also lived in a high-stress environment with high trauma rates, and about 80% died before the age of 40. Evidence for interbreeding between Neanderthals and anatomically modern humans was presented in the 2010 Neanderthal genome project's draft report. It possibly occurred 316–219 kya and more likely 100 kya and again after 65 kya. Around 1–4% of all non-Subsaharan African genomes (Eurasians, Oceanians, Native Americans, and North Africans) derive from Neanderthals, and about 20% of the Neanderthal genome survives today. Though many of the inherited genes may have been detrimental and selected out, Neanderthal introgression appears to have affected the modern human immune system.
Neanderthals are named after the valley, the Neandertal, in which the first identified specimen was found. The valley was spelled Neanderthal and the species was spelled Neanderthaler in German until the spelling reform of 1901.[b] The spelling Neandertal for the species is occasionally seen in English, even in scientific publications, but the scientific name, H. neanderthalensis, is always spelled with th according to the principle of priority. The vernacular name of the species in German is always Neandertaler ("inhabitant of the Neander Valley"), whereas Neandertal always refers to the valley.[c] The valley itself was named after German theologian and hymn writer Joachim Neander who often visited the area.
Standard British pronunciation is usually with /t/ (as in //) because the old German spelling th used before the 1901 spelling reform represents the phoneme /t/, not the English pronunciation of th with the fricative /θ/, but this pronunciation (as //) is often used especially in North America.
Neanderthal 1, the type specimen, was known as the "Neanderthal cranium" or "Neanderthal skull" in anthropological literature, and the individual reconstructed on the basis of the skull was occasionally called "the Neanderthal man". The binomial name Homo neanderthalensis—extending the name "Neanderthal man" from the individual specimen to the entire species, and formally recognizing it as distinct from humans—was first proposed by Irish geologist William King in a paper read to the 33rd British Science Association in 1863. However, in 1864, he recommended that Neanderthals and modern humans be classified in different genera as he compared the Neanderthal braincase to that of a chimpanzee and argued that they were "incapable of moral and [theistic[d]] conceptions".
The first Neanderthal remains—Engis 2 (a skull)—were discovered in 1829 by Dutch naturalist Philippe-Charles Schmerling in the Schmerling Caves, Belgium, but he thought it was an ancient skull of an anatomically modern human. In 1848, Gibraltar 1 from Forbes' Quarry was presented to the Gibraltar Scientific Society by their Secretary Lieutenant Edmund Henry Réné Flint, but was also thought to be a modern human skull. In 1856, local schoolteacher Johann Carl Fuhlrott recognized bones from Feldhofer Cave in Neander Valley—Neanderthal 1 (the holotype specimen)—as distinct from modern humans,[e] and gave them to German anthropologist Hermann Schaaffhausen to study in 1857. It comprised the cranium, thigh bones, right arm, left humerus and ulna, left ilium (hip bone), part of the right shoulder blade, and pieces of the ribs. Following Charles Darwin's On the Origin of Species, Fuhlrott and Schaaffhausen argued the bones represented an ancient modern human form; Schaaffhausen, a social Darwinist, believed that humans linearly progressed from savage to civilised, and so concluded that Neanderthals were barbarous cave-dwellers. Fuhlrott and Schaaffhausen met opposition namely from the prolific pathologist Rudolf Virchow who argued against defining new species based on only a single find. In 1872, Virchow erroneously interpreted Neanderthal characteristics as evidence of senility, disease, and malformation instead of archaicness, which stalled Neanderthal research until the end of the century.
By the early 20th century, numerous other Neanderthal discoveries were made, establishing H. neanderthalensis as a legitimate species. The most influential specimen was La Chapelle-aux-Saints 1 from La Chapelle-aux-Saints, France. French palaeontologist Marcellin Boule authored several publications, among the first to establish palaeontology as a science, detailing the specimen, but reconstructed it as ape-like and only remotely related to modern humans. The 1912 'discovery' of Piltdown Man (a hoax), appearing much more similar to modern humans than Neanderthals, was used as evidence that multiple different and unrelated branches of primitive humans existed, and supported Boule's reconstruction of H. neanderthalensis as a far distant relative and an evolutionary dead-end. He fueled the popular image of Neanderthals as barbarous, slouching, club-wielding primitives; this image was reproduced for several decades and popularised in science fiction works, such as the 1911 The Quest for Fire by J.-H. Rosny aîné and the 1927 The Grisly Folk by H. G. Wells where they are depicted as monsters. In 1911, Scottish anthropologist Arthur Keith reconstructed La Chapelle-aux-Saints 1 as an immediate precursor to modern humans, sitting next to a fire, producing tools, wearing a necklace, and having a more humanlike posture, but this failed to garner much scientific rapport, and Keith later abandoned his thesis in 1915.
By the middle of the century, based on the exposure of Piltdown Man as a hoax as well as reexamination of La Chapelle-aux-Saints 1 (who had osteoarthritis which caused slouching in life) and new discoveries, the scientific community began to rework its understanding of Neanderthals. Ideas such as Neanderthal behaviour, intelligence, and culture were being discussed, and a more humanlike image of them emerged. In 1939, American anthropologist Carlton Coon reconstructed a Neanderthal in a modern business suit and hat to emphasize that they would be, more or less, indistinguishable from modern humans had they survived into the present. William Golding's 1955 novel The Inheritors depicts Neanderthals as much more emotional and civilised. However, Boule's image continued to influence works until the 1960s. In modern day, Neanderthal reconstructions are often very humanlike.
Hybridisation between Neanderthals and early modern humans had been suggested early on, such as by English anthropologist Thomas Huxley in 1890, Danish ethnographer Hans Peder Steensby in 1907, and Coon in 1962. In the early 2000s, supposed hybrid specimens were discovered: Lagar Velho 1 and Muierii 1. Neanderthal admixture was found to be present in modern populations in 2010 with the mapping of the first Neanderthal genome sequence.
|Phylogeny based on comparison of ancient proteomes and genomes with those of modern species.|
Neanderthals are hominids in the genus Homo, humans, and generally classified as a distinct species, H. neanderthalensis, though sometimes as a subspecies of modern human as H. sapiens neanderthalensis. This would necessitate the classification of modern humans as H. s. sapiens.
A large part of the controversy stems from the vagueness of the term "species", as it is generally used to distinguish two genetically isolated populations, but admixture between modern humans and Neanderthals is known to have occurred. However, the absence of Neanderthal-derived patrilineal Y-chromosome and matrilineal mitochondrial DNA (mtDNA) in modern humans, along with the underrepresentation of Neanderthal X chromosome DNA, could imply reduced fertility or frequent sterility of some hybrid crosses, representing a partial biological reproductive barrier between the groups.
Neanderthals are thought to have been more closely related to Denisovans than to modern humans. Likewise, Neanderthals and Denisovans share a more recent last common ancestor (LCA) based on nuclear DNA (nDNA) than to humans. However, Neanderthals and modern humans share a more recent LCA based on mtDNA. This likely resulted from an interbreeding event subsequent to the Neanderthal/Denisovan split which introduced another mtDNA line. This involved either introgression coming from an unknown archaic human into Denisovans, or introgression from an earlier unidentified modern human wave from Africa into Neanderthals.
It is largely thought that H. heidelbergensis was the last common ancestor of Neanderthals, Denisovans, and modern humans before populations became isolated in Europe, Asia, and Africa respectively. The taxonomic distinction between H. heidelbergensis and Neanderthals is mostly based on a fossil gap in Europe between 300 and 243 thousand years ago (kya) during marine isotope stage 8. "Neanderthals", by convention, are fossils which date to after this gap. However, 430 thousand year (ka) old bones at Sima de los Huesos could represent early Neanderthals or a closely related group, and the 400 ka old Aroeira 3 could represent a transitional phase. Ancestral and derived morphs could have lived concurrently. It is also possible that there was gene flow between Western Europe and Africa during the Middle Pleistocene, obscuring Neanderthal characteristics in such specimens, namely from Ceprano, Italy, and Sićevo Gorge, Serbia. The fossil record is much more complete from 130 kya onwards, and specimens from this period make up the bulk of known Neanderthal skeletons. Dental remains from the Italian Visogliano and Fontana Ranuccio sites indicate that Neanderthal dental features had evolved by around 450–430 kya during the Middle Pleistocene.
There are two main hypotheses regarding the evolution of Neanderthals following the Neanderthal/human split: two-phase and accretion. Two-phase argues a single major environmental event—such as the Saale glaciation—caused European H. heidelbergensis to rapidly increase body size and robustness, as well as undergo an enlengthenment of the head (phase 1), which then led to other changes in skull anatomy (phase 2). However, Neanderthal anatomy was most likely not driven by adapting to cold weather. Accretion holds that Neanderthals slowly evolved over time from the ancestral H. heidelbergensis, divided into 4 stages: early-pre-Neanderthals (MIS 12), pre-Neanderthals (MIS 11–9), early Neanderthals (MIS 7–5), and classic Neanderthals (MIS 4–3).
Numerous dates for the Neanderthal/human split have been suggested. The date of around 250 kya cites "H. helmei" as being the last common ancestor (LCA), and the split is associated with the Levallois technique of making stone tools. The date of about 400 kya uses H. heidelbergensis as the LCA. 600 kya says that "H. rhodesiensis" was the LCA, which split off into modern human lineage and a Neanderthal/H. heidelbergensis lineage. 800 kya has H. antecessor as the LCA; however, different variations of this model would push the date back to 1 million years ago. DNA studies have yielded various results on divergence time, such as 592–182 kya, 553–321 kya,, 565-503 kya, 654–475 kya, 690–550 kya, 765–550 kya, 741–317 kya, 800–520 kya, before 800 kya, and so forth.
Neanderthals and Denisovans are more closely related to each other than they are to modern humans, meaning the Neanderthal/Denisovan split occurred after their split with modern humans. Assuming a mutation rate of 1x10−9 or 0.5x10−9 per base pair (bp) per year, the Neanderthal/Denisovan split occurred around either 236–190 kya or 473–381 kya respectively. Using 1.1x10−8 per generation with a new generation every 29 years, the time is 744 kya. Using 5x10−10 nucleotide site per year, it is 644 kya. Using the latter dates, the split had likely already occurred by the time hominins spread out across Europe, and unique Neanderthal features had begun evolving by 600–500 kya. Before splitting, Neanderthal/Denisovans (or "Neandersovans") migrating out of Africa into Europe apparently interbred with an unidentified "superarchaic" human species who were already present there; these superarchaics were the descendants of a very early migration out of Africa around 1.9 mya.
Early Neanderthals, living before the Eemian interglacial (130 kya), are poorly known and come mostly from European sites. From 130 kya onwards, the quality of the fossil record increases dramatically. These later Neanderthals are recorded from Western, Central, Eastern, and Mediterranean Europe, as well as Southwest, Central, and Northern Asia up to the Altai Mountains in southern Siberia.
The southernmost find was recorded at Shuqba Cave, Levant; reports of Neanderthals from the North African Jebel Irhoud and Haua Fteah have been reidentified as H. sapiens. Their easternmost presence is recorded at Denisova Cave, Siberia 85°E; the southeast Chinese Maba Man, a skull, shares several physical attributes with Neanderthals, though these may be the result of convergent evolution rather than Neanderthals extending their range to the Pacific Ocean. The limit of their northern bound appears to have been 53°N (Bontnewydd, Wales), although it is difficult to assess because glacial advances destroy most human remains; Middle Palaeolithic artefacts have been found up to 60°N on the Russian plains, but these are more likely attributed to modern humans. A 2017 study claimed the presence of Homo at the 130 ka Californian Cerutti Mastodon site in North America, but this is largely considered implausible.
It is unknown how the rapidly fluctuating climate of the last glacial period (Dansgaard–Oeschger events) impacted Neanderthals, as warming periods would produce more favorable temperatures but encourage forest growth and deter megafauna, whereas frigid periods would produce the opposite. However, Neanderthals may have preferred a forested landscape. Populations may have peaked in cold but not extreme intervals, such as marine isotope stages 8 and 6 (respectively 300 and 191 kya). It is possible their range expanded and contracted as the ice retreated and grew respectively to avoid permafrost areas, residing in certain refuge zones during glacial maximums.
Early specimens from Mezmaiskaya Cave in the Caucasus and Denisova Cave in the Siberian Altai Mountains differ genetically from those found in Western Europe, whereas later specimens from these caves both have genetic profiles more similar to Western European Neanderthal specimens than to the earlier specimens from the same locations, suggesting long-range migration and population replacement over time. Similarly, artefacts and DNA from Chagyrskaya and Okladnikov Caves, also in the Altai Mountains, resemble those of eastern European Neanderthal sites more than they do artefacts and DNA of the older Neanderthals from Denisova Cave, suggesting two distinct migration events into Siberia.
Like modern humans, Neanderthals probably descended from a very small population with an effective population—the number of individuals who can bear children—of 3,000 to 12,000 approximately. However, Neanderthals maintained this very low population, living in small, isolated, inbred groups. Various studies, using mtDNA analysis, yield varying effective populations, such as about 1,000 to 5,000; 5,000 to 9,000 remaining constant; or 3,000 to 25,000 steadily increasing until 50,000 BCE before declining until extinction. However, all agree on low population, which may have been up to 10 times smaller than contemporary human populations in Western Europe. Estimates giving a total population in the tens of thousands are contested. A consistently low population may be explained in the context of the "Boserupian Trap": a population's carrying capacity is limited by the amount of food it can obtain, which in turn is limited by its technology. Innovation increases with population, but if the population is too low, innovation will not occur very rapidly and the population will remain low. This is consistent with the apparent 150 ka stagnation in Neanderthal lithic technology.
In a sample of 206 Neanderthals, based on the abundance of young and mature adults in comparison to other age demographics, about 80% of them above the age of 20 died before reaching 40. This high mortality rate was probably due to their high-stress environment. However, it has also been estimated that the age pyramids for Neanderthals and contemporary modern humans were the same. Infant mortality was estimated to have been very high for Neanderthals, about 43% in northern Eurasia.
Based on 45 Neanderthal long bones from 14 men and 7 women, the average height was 164 to 168 cm (5 ft 5 in) for males and 152 to 156 cm (5 ft) for females. For comparison, the average height of 16 Upper Paleolithic and Mesolithic modern humans was 168.1 cm (5 ft 6 in) for males and 152.5 cm (5 ft) for females. The fossil record shows adult Neanderthals varied from about 147.5 to 177 cm (4 ft 10 in to 5 ft 10 in) in height, though it is possible that some grew much taller. For Neanderthal weight, samples of 26 specimens found an average of 77.6 kg (171 lb) for males and 66.4 kg (146 lb) for females. Using 76 kg (168 lb), the body mass index for Neanderthal males was calculated to be 26.9–28.2, which in modern humans correlates to being overweight. This indicates a very stocky build. The Neanderthal LEPR gene concerned with storing fat and body heat production is similar to that of the woolly mammoth, and so was likely an adaptation for cold climate.
The neck vertebrae of Neanderthals are longer and thicker than those of modern humans, lending to stability, possibly due to different head shape and size. Though the Neanderthal thorax (where the ribcage is) was similar in size to modern humans, the longer and straighter ribs would have equated to a widened mid-lower thorax and stronger breathing in the lower thorax, which are indicative of a larger diaphragm and possibly greater lung capacity. The lung capacity of Kebara 2 was estimated to have been 9.04 L (2.39 US gal). The Neanderthal chest was also more pronounced (expanded front-to-back, or antero-posteriorly). The sacrum (where the pelvis connects to the spine) was more vertically inclined, and was placed lower in relation to the pelvis, causing the spine to be less curved (exhibit less lordosis) and to fold in on itself somewhat (to be invaginated). Such modifications to the spine would have enhanced side-to-side (mediolateral) flexion, better supporting the wider lower thorax. This condition may be normal for Homo, with the condition of a narrower thorax in modern humans being a unique characteristic.
Body proportions were usually cited as being "hyperarctic" as adaptations to the cold, because they are similar to those of human populations which developed in cold climates—the Neanderthal build is most similar to that of Inuit and Siberian Yupiks among modern humans—and shorter limbs equates to higher retention of body heat. However, Neanderthals from more temperate climates—such as Iberia—still retain the "hyperarctic" physique. Further, the increasing evidence that Neanderthals preferred warmer wooded areas instead of open mammoth steppe and cold climate suggests to the contrary, and DNA analysis indicates a higher proportion of fast-twitch muscle fibres in Neanderthals than modern humans. It is possible their body proportions and greater muscle mass were adaptations to sprinting as opposed to the endurance-oriented modern human physique, as persistence hunting may only be effective in hot climates where the hunter can run prey to the point of heat exhaustion (hyperthermia). They had longer heel bones, reducing their ability for endurance running. Their shorter limbs would have reduced moment arm at the limbs, allowing for greater rotational force at the wrists and ankles without extra exertion of the rotating muscles at the elbows and knees by increasing the speed at which the muscles contracted, causing faster acceleration.
Neanderthals had a reduced chin, sloping forehead, and large nose, which also started somewhat higher on the face than in modern humans. The Neanderthal skull is typically more elongated and less globular than that of modern humans, and features an occipital bun, or "chignon", a protrusion on the back of the skull, though it is within the range of variation for humans who have it. It is caused by the cranial base and temporal bones being placed higher and more towards the front of the skull, and a flatter skullcap. They also had larger eyes likely to adapt to the low-light environment.
The large Neanderthal nose and paranasal sinuses have generally been explained as having warmed air as it entered the lungs and retained moisture ("nasal radiator hypothesis"); but sinuses are generally reduced in cold-adapted creatures, and it may have been that the large nose was caused instead by genetic drift. Also, the sinuses are not grossly large, and are comparable in size to those of modern humans. However, sinus size is not an important factor for breathing cold air, and their actual function is unclear, so they may not be a good indicator of evolutionary pressures to evolve such a nose. Further, a computer reconstruction of the Neanderthal nose and predicted soft tissue patterns shows some similarities to those of modern Arctic peoples, potentially meaning the noses of both populations convergently evolved for cold, dry air.
Neanderthals featured a protrusion of the jaw (prognathism), which was once cited as a response to a large bite force evidenced by heavy wearing of Neanderthal front teeth (the "anterior dental loading hypothesis"), but similar wearing trends are seen in contemporary humans. It could also have evolved to fit larger teeth in the jaw, which would better resist wear and abrasion, and the increased wear on the front teeth compared to the back teeth probably stems from repetitive use. Neanderthal dental wear patterns are most similar to those of modern Inuit. The incisors are large and shovel-shaped, and, compared to modern humans, there was an unusually high frequency of taurodontism, a condition where the molars are bulkier due to an enlarged pulp (tooth core). Taurodontism was once thought to have been a distinguishing characteristic of Neanderthals which lent some mechanical advantage or stemmed from repetitive use, but was more likely simply a product of genetic drift. The bite force of Neanderthals and modern humans is now thought to be about the same, about 285 N (64 lbf) and 255 N (57 lbf) in modern human males and females, respectively.
The Neanderthal braincase averages 1,600 cm3 (98 in3) for males and 1,300 cm3 (79 in3) for females, within the possible range of modern humans, which is, on average, 1,270 cm3 (78 in3) for males and 1,130 cm3 (69 in3) for females. The largest Neanderthal brain, Amud 1, was calculated to be 1,736 cm3 (105.9 in3), one of the largest ever recorded in hominids. However, both Neanderthal and human infants measure about 400 cm3 (24 in3), and either Neanderthal brain development sped up or modern human development slowed down from the last common ancestor.
In Neanderthals, the occipital lobe—operating vision—was much larger than in modern humans, and, similarly, they had larger eyes, probably as an adaptation to lower light conditions in Europe. More brain tissue was devoted to bodily maintenance and control, and, consequently, the cognitive areas of the brain were proportionally smaller than in modern humans, including the cerebellum (operating muscle memory, and possibly language, attention, working memory, social abilities, and thought), the parietal lobes (visuospatial function and episodic memory), the temporal lobes (language comprehension and associations with emotions), the orbitofrontal cortex (decision making), and the olfactory bulb (sense of smell). A 2011 study looking at the brain asymmetry of 20 Neanderthals to predict handedness found 85% to have been right-hand dominant and the remaining 15% left-handed, whereas modern humans are 52% right-dominant, 12% left-dominant, and 36% ambidextrous.
Hair and skin colour
The lack of sunlight most likely led to the proliferation of lighter skin in Neanderthals, though light skin in modern Europeans was not particularly prolific until perhaps the Bronze Age. Genetically, BNC2 was present in Neanderthals, which is associated with light skin colour; however, a second variation of BNC2 was also present, which is associated with darker skin colour in the UK Biobank. It is likely Neanderthal skin colour varied from region to region. The DNA of three Croatian Neanderthals shows they had darker hair, skin, and eye colour than modern Europeans.
In modern humans, skin and hair colour is regulated by the melanocyte-stimulating hormone—which increases the proportion of eumelanin (black pigment) to phaeomelanin (red pigment)—which is encoded by the MC1R gene. There are 5 known variants in modern humans of the gene which cause loss-of-function and are associated with light skin and hair colour, and another unknown variant in Neanderthals (the R307G variant) which could be associated with pale skin and red hair. The R307G variant was identified in a Neanderthal from Monti Lessini, Italy, and possibly Sidrón Cave, Spain. However, like in modern humans, red was probably not a very common hair colour because the variant is not present in many other sequenced Neanderthals.
The Neanderthal physical activity level (PAL) was assumed to be a very high 650 counts per minute per day (CPM/d), in comparison to 200 CPM/d in modern Siberian hunter-gatherers. Average body fat percentage (BFP) was estimated to be 25%, though it may have been 13% for males and 20% for females in more temperate areas. Using these measurements and average height and weight, the daily total energy expenditure (TEE)—the amount of calories consumed in one day—was estimated to be 3,454–4,019 and 3,828–4,483 kcal for males with high and low BFPs respectively, and 3,115–3,538 and 3,258–3,710 kcal for females. However, if the PAL was reduced to that of modern Siberian hunter-gatherers, the TEE becomes 2,959–3,524 and 3,333–3,988 kcal for males, and 2,620–3,043 and 2,764–3,215 kcal for females. This is comparable with the upper end of energetic demands of modern hunter gatherers, and the latter estimates are most similar to the Siberian Yakuts, which contradicts earlier estimates of vastly higher energetic demands in Neanderthals than modern humans. Further, some Neanderthal populations are thought to have had a predominantly low-calorie plant diet, which suggests the minimum daily caloric intake was also low.
Maximum natural lifespan and the timing of adulthood, menopause, and gestation were most likely very similar to modern humans. However, it has been hypothesised that Neanderthals matured faster than modern humans based on the growth rates of teeth and tooth enamel, though this is not backed up by age biomarkers. The main differences in maturation are the atlas bone in the neck as well as the middle thoracic vertebrae fused about 2 years later in Neanderthals than in modern humans, but this was more likely caused by a difference in anatomy rather than growth rate.
Neanderthals may have been more active during dimmer light conditions rather than broad daylight because they lived in regions with reduced daytime hours, hunted large game (such predators typically hunt at night to enhance ambush tactics), and had large eyes and visual processing neural centres. Genetically, colour blindness (which may enhance mesopic vision) is typically correlated with northern-latitude populations, and the Neanderthals from Vindija Cave, Croatia, had some substitutions in the Opsin genes which could have influenced colour vision (however, the functional implications of these substitutions are inconclusive). Neanderthal-derived alleles near ASB1 and EXOC6 are associated with being an evening person, narcolepsy, and day-time napping.
Neanderthals suffered a high rate of traumatic injury, with an estimated 79–94% of specimens showing evidence of healed major trauma, of which 37–52% were severely injured, and 13–19% injured before reaching adulthood; and an estimated 80% succumbed to their injuries and died before reaching 40. It was thus theorized that Neanderthals employed a risky hunting strategy. One extreme example is Shanidar 1, who shows signs of an amputation of the right arm likely due to a nonunion after breaking a bone in adolescence, osteomyelitis (a bone infection) on the left clavicle, an abnormal gait, vision problems in the left eye, and possible hearing loss (perhaps swimmer's ear).
However, trauma patterns between Neanderthals and contemporary humans are about the same, and rates of cranial trauma are not significantly different between Neanderthals and Middle Paleolithic modern humans, which indicate that they got hurt doing the same things. Therefore, interpersonal violence or large carnivores were more likely the source of severe trauma than risky hunting strategies. A 2016 study looking at 124 Neanderthal specimens found that about 36% were victims of bear attacks, 21% big cat attacks, and 17% wolf attacks (totalling 92 positive animal attack cases, 74%). There were no cases of hyaena attacks, though hyaenas still nonetheless probably killed Neanderthals, at least opportunistically; however, hyaenas and Neanderthals may have actively avoided each other. Such intense predation probably stemmed from common confrontations due to competition over food and cave space, and from Neanderthals hunting these carnivores.
Likely due to advanced age (60s or 70s), La Chapelle-aux-Saints 1 had signs of Baastrup's disease, affecting the spine, and osteoarthritis. Shanidar 1, who likely died at about 40 or 50, was diagnosed with the most ancient case of diffuse idiopathic skeletal hyperostosis (DISH), a degenerative disease which can restrict movement.
Low population caused a low genetic diversity and probably inbreeding, which reduced the population's ability to filter out harmful mutations (inbreeding depression). However, it is unknown how this affected a single Neanderthal's genetic burden and, thus, if this caused a higher rate of birth defects than in humans. It is known, however, that the 13 inhabitants of Sidrón Cave collectively exhibited 17 different birth defects likely due to inbreeding.
Neanderthals were likely subject to several infectious diseases and parasites. Modern humans likely transmitted diseases to them; one possible candidate is the stomach bacteria Helicobacter pylori. The modern human papillomavirus variant 16A may descend from Neanderthal introgression. A Neanderthal at Sidrón Cave shows evidence of a gastrointestinal Enterocytozoon bieneusi infection. The leg bones of La Ferrassie 1 feature lesions that are consistent with periostitis—inflammation of the tissue enveloping the bone—likely a result of hypertrophic osteoarthropathy, which is primarily caused by a chest infection or lung cancer. Neanderthals had a lower cavity rate than modern humans, despite some populations consuming typically cavity-causing foods in great quantity, which could indicate a lack of cavity-causing oral bacteria, namely Streptococcus mutans.
Two 250 ka old Neanderthal children from Payré, France, present the earliest known cases of lead exposure of any hominin. They were exposed on two distinct occasions either by eating or drinking contaminated food or water, or inhaling lead-laced smoke from a fire. There are two lead mines within 25 km (16 mi) of the site.
Neanderthals likely lived in more sparsely distributed groups than contemporary modern humans, but group size is thought to have averaged 10 to 30 individuals, similar to modern hunter-gatherers. Reliable evidence of Neanderthal group composition comes from Sidrón Cave, Spain, and the footprints at Le Rozel, France: the former shows 7 adults, 3 adolescents, 2 juveniles, and an infant; whereas the latter, based on footprint size, shows a group of 10 to 13 members where juveniles and adolescents made up 90%.
A Neanderthal child's teeth analysed in 2018 showed it was weaned after 2.5 years, similar to modern hunter gatherers, and was born in the spring, which is consistent with modern humans and other mammals whose birth cycles coincide with environmental cycles. Indicated from various ailments resulting from high stress at a low age, such as stunted growth, British archaeologist Paul Pettitt hypothesised that children of both sexes were put to work directly after weaning; and American palaeoanthropologist Erik Trinkaus said that, upon reaching adolescence, an individual may have been expected to join in hunting large and dangerous game. However, the bone trauma is comparable to modern Inuit, and their childhood was more likely similar to contemporary modern humans. Further, such stunting more likely resulted from harsh winters and bouts of low food resources.
Sites showing evidence of no more than three individuals may have represented nuclear families or temporary camping sites for special task groups (such as a hunting party). Bands likely moved between certain caves depending on the season, indicated by remains of seasonal materials such as certain foods, and returned to the same locations generation after generation. Some sites may have been used for over 100 years. Cave bears may have greatly competed with Neanderthals for cave space, and there is a decline in cave bear populations starting 50 kya onwards (though their extinction is attributed to modern humans). Though Neanderthals are generally considered to have been cave dwellers, with 'home base' being a cave, open-air settlements near contemporaneously inhabited cave systems in the Levant could indicate mobility between cave and open-air bases in this area. A long-term open-air settlement is known from the 'Ein Qashish site in Israel.
A self-sustaining population which avoids inbreeding consists of about 450–500 individuals, which would necessitate these bands to interact with 8–53 other bands, but more likely the more conservative estimate given low population density. Analysis of the mtDNA of the Neanderthals of Sidrón Cave, Spain, showed that the adult three men belonged to the same maternal lineage, while the three adult women belonged to different ones. This suggests a patrilocal residence (that a woman moved out of her group to live with her husband). However, the DNA of a Neanderthal from Denisova Cave, Russia, shows that her parents were half-siblings, and the inhabitants of Sidrón Cave were likely highly inbred. Neanderthal groups probably rarely exchanged mates given the abundance of harmful genes.
Considering most Neanderthal artefacts were sourced no more than 5 km (3.1 mi) from the main settlement, it is unlikely these bands interacted very often. However, a skeleton from La Roche à Pierrot, France, showed a healed fracture on top of the skull apparently caused by a deep blade wound, and another from Shanadir Cave, Iraq, was found to have a rib lesion characteristic of projectile weapon injuries, which could be considered as evidence for conflict.
A few Neanderthal artefacts in a settlement could have originated 20, 30, 100, and 300 km (12.5, 18.5, 60, and 185 mi) away. Based on this, Canadian ethnoarchaeologist Brian Hayden suggested that macro-bands formed, collectively encompassing 13,000 km2 (5,000 sq mi), with each band claiming 1,200–2,800 km2 (460–1,080 sq mi), maintaining strong alliances for mating networks or to cope with leaner times and enemies as is exhibited in the low-density hunter gatherer societies of the Western Desert of Australia. Hayden also noted an apparent cemetery of six or seven individuals at La Ferrassie, France, which, in modern humans, is typically used as evidence of a corporate group which maintained a distinct social identity and controlled some resource, trading, manufacturing, and so on. La Ferrassie is also located in one of the richest animal-migration routes of Pleistocene Europe. However, mapping of the Neanderthal brain and their small group size and population density could indicate that they had a reduced ability for inter-group interaction and trade.
It is sometimes suggested, since they were hunters of challenging big game and lived in small groups, there was no sexual division of labour as seen in modern hunter gatherer societies. That is, men, women, and children all had to be involved in hunting, instead of men hunting with women and children foraging. However, with modern hunter gatherers, the higher the meat dependency, the higher the division of labour. Further, tooth-wearing patterns in Neanderthal men and women suggest they commonly used their teeth for carrying items, but men exhibit more wearing on the upper teeth, and women the lower, suggesting some cultural differences in tasks.
It is controversially proposed that some Neanderthals wore decorative clothing or jewellery—such as a leopard skin or raptor feathers—to display elevated status in the group. Hayden postulated that the small number of Neanderthal graves found was because only high-ranking members would receive an elaborate burial, as is the case for some modern hunter gatherers. Trinkaus suggested that elderly Neanderthals were given special burial rites for lasting so long given the high mortality rates. Alternatively, many more Neanderthals may have received burials, but the graves were infiltrated and destroyed by bears. Given that 20 graves of Neanderthals aged under 4 have been found—over a third of all known graves—deceased children may have received greater care during burial than other age demographics.
Looking at Neanderthal skeletons recovered from several natural rock shelters, Trinkaus said that, although Neanderthals were recorded as bearing several trauma-related injuries, none of them had significant trauma to the legs that would debilitate movement. He suggested that self worth in Neanderthal culture derived from contributing food to the group; a debilitating injury would remove this self-worth and result in near-immediate death, and individuals who could not keep up with the group while moving from cave to cave were left behind. However, there are several examples of individuals with highly debilitating injuries being nursed for several years, and, lacking much contact with neighbouring groups, they may have focused extra attention onto group member wellbeing. Such an altruistic strategy may have ensured their survival as a species for so long, especially given the high trauma rates.
Hunting and gathering
Neanderthals were once thought of as scavengers, but are now considered to have been apex predators. Living in a forested environment, Neanderthals were likely ambush hunters, getting close to and attacking their target—a prime adult—in a short burst of speed, thrusting in a spear at close quarters. Younger or wounded animals may have been hunted using traps, projectiles, or pursuit. Nonetheless, they were able to adapt to a variety of habitats. They appear to have eaten predominantly what was abundant within their immediate surroundings, with forest-dwelling communities consuming a wide array of plants, steppe-dwelling communities subsisting almost entirely on meat, and waterside communities gathering aquatic resources. Contemporary humans, in contrast, seem to have used more complex food extraction strategies and generally had a more diverse diet. In 1980, it was hypothesised that two piles of mammoth skulls at La Cotte de St Brelade, Channel Islands, at the base of a gulley was evidence of mammoth drive hunting (causing them to stampede off a ledge), but this is contested.
For meat, they appear to have fed predominantly on hoofed mammals, namely red deer and reindeer as these two were the most abundant game, but also on other Pleistocene megafauna such as ibex, wild boar, aurochs, mammoth, straight-tusked elephant, woolly rhinoceros, and so on. There is evidence of directed cave and brown bear hunting both in and out of hibernation, as well as butchering. Analysis of Neanderthal bone collagen from Vindija Cave, Croatia, shows nearly all of their protein needs derived from animal meat. Some caves show evidence of regular rabbit and tortoise consumption. At Gibraltar sites, there are remains of 143 different bird species, many ground-dwelling such as the common quail, corn crake, woodlark, and crested lark. Neanderthals also exploited marine resources on the Iberian, Italian, and Peloponnesian Peninsulas, where they waded or dived for shellfish, and, at Vanguard Cave, Gibraltar, consumed Mediterranean monk seal, short-beaked common dolphin, common bottlenose dolphin, Atlantic bluefin tuna, sea breem, and purple sea urchin. Evidence of freshwater fishing was found in Castelcivita Cave, Italy, for trout, chub, and eel; Abri du Maras, France, for chub and European perch; Payré, France; Kudaro Cave, Russia, for Black Sea salmon; and Figueira Brava Cave near Setúbal, Portugal, for large-scale harvest of shellfish, crabs, and fish.
Neanderthal communities also included a wide array of plants in their diets. Edible plant and mushroom remains are recorded from several caves. Neanderthals from Sidrón Cave, Spain, based on dental tartar, likely had a meatless diet of mushrooms, pine nuts, and moss, indicating they were forest foragers. Remnants from Amud Cave, Israel, indicates a diet of figs, palm tree fruits, and various cereals and edible grasses. Several bone traumas in the leg joints could possibly suggest habitual squatting, which, if the case, was likely done while gathering food. Dental tartar from Spy Cave, Belgium, indicates the inhabitants had a meat-heavy diet including woolly rhinoceros and mouflon sheep, while also regularly consuming mushrooms. Neanderthal faecal matter from El Salt, Spain, dated to 50 kya—the oldest human faecal matter remains recorded—show elevated coprostanol levels (digested cholesterol indicating a meat-heavy diet) and elevated stigmastanol (deriving from plant matter). Evidence of cooked food plants—mainly legumes and, to a far lesser extent, acorns—was discovered in Kebara Cave, Israel, with its inhabitants possibly gathering plants in spring and fall and hunting in all seasons except fall, though the cave was probably abandoned in late summer to early fall. At Shanidar Cave, Iraq, Neanderthals collected plants with various harvest seasons, indicating they scheduled returns to the area to harvest certain plants, and that they had complex food-gathering behaviours for both meat and plants.
Neanderthals probably could employ a wide range of cooking techniques, such as roasting, and they may have been able to heat up or boil soup, stew, or animal stock. The abundance of animal bone fragments at settlements may indicate the making of fat stocks from boiling bone marrow, possibly taken from animals that had already died of starvation. These methods would have substantially increased protein consumption, which was a major nutritional component of communities with low carbohydrate intake. Neanderthal tooth size had a decreasing trend after 100 kya, which could indicate an increased dependence on cooking or the advent of boiling, a technique that would have softened food.
At Sidrón Cave, Spain, Neanderthals likely cooked and possibly smoked food, as well as used certain plants—such as yarrow and camomile—as flavouring, though these plants may have instead been used for their medicinal properties. Further, the former hypothesis would assume a degree of cuisine complexity which lacks proper evidence. However, flavouring food may not require greatly enhanced humanlike cognitive or imaginative abilities, as Japanese macaques are known to dunk sweet potatoes and wheat in the ocean before eating them to give them a salty taste. At Gorham's Cave, Gibraltar, Neanderthals may have been roasting pinecones to access pine nuts.
After a big kill, the animal would probably have been butchered on the spot as it is unlikely they hauled back big kills intact to a settlement, nor that the entire group (including pregnant women and infants) followed the hunting party to eat at the site of the kill. To prevent spoilage during transport, one practical method would have been to construct scaffolds to hang and dry the meat, which would have also reduced overall weight by a third. Though there is no evidence that they could store food, it seems likely they had the ability considering the great quantities of meat and fat which could have been gathered from typical prey items (namely mammoths). Shellfish spoils very quickly after collection, and must be eaten or cooked soon after death; at Cueva de los Aviones, Spain, the remains of edible, algae eating shellfish associated with the alga Jania rubens could indicate harvested shellfish were stored in water-soaked algae to keep them alive and fresh until consumption like some modern hunter gatherer societies.
Competition from large Ice Age predators was rather high. Cave lions likely targeted horses, large deer and wild cattle; and leopards primarily reindeer and roe deer; which heavily overlapped with Neanderthal diet. To defend a kill against such ferocious predators, Neanderthals may have engaged in a group display of yelling, arm waving, or stone throwing; or quickly gathered meat and abandoned the kill. However, at Spy Cave, Belgium, the remains of wolves, cave lions, and cave bears—which were all major predators of the time—indicate Neanderthals hunted their competitors to some extent.:120–143
Neanderthals and cave hyaenas may have exemplified niche differentiation, and actively avoided competing with each other. Though they both mainly targeted the same groups of creatures—deer, horses, and cattle—Neanderthals mainly hunted the former and cave hyaenas the latter two. Further, animal remains from Neanderthal caves indicate they preferred to hunt prime individuals, whereas cave hyaenas hunted weaker or younger prey, and cave hyaena caves have a higher abundance of carnivore remains. Nonetheless, there is evidence that cave hyaenas stole food and leftovers from Neanderthal campsites and scavenged on dead Neanderthal bodies.
There are several instances of Neanderthals practising cannibalism across their range. The first undisputed example came from Gran Dolina in 1999, and other examples were found at Sidrón Cave and Zafarraya in Spain; and the French Moula-Guercy Cave, Les Pradelles, and La Quina. For the five cannabalised Neanderthals at the Goyet Caves, Belgium, there is evidence that the upper limbs were disarticulated, the lower limbs defleshed and also smashed (likely to extract bone marrow), the chest cavity disemboweled, and the jaw dismembered. There is also evidence that the butchers used some bones to retouch their tools. The processing of Neanderthal meat at Goyet Caves is similar to how they processed horse and reindeer. About 35% of the Neanderthals at Marillac-le-Franc, France, show clear signs of butchery, and the presence of digested teeth indicates that the bodies were abandoned and eaten by scavengers, likely hyaenas.
These cannibalistic tendencies have been explained as either ritual defleshing, pre-burial defleshing (to prevent scavengers or foul smell), for nutritional value, or as an act of war. Due to a small number of cases, and the higher number of cut marks seen on cannibalized individuals than animals (indicating inexperience), cannibalism was probably not a very common practice, and it may have only been done in times of extreme food shortages as in some cases in recorded human history.
A number of claims of Neanderthal art and adornment have been made. If accurate, these claims would show that Neanderthals were capable of symbolic thought or were cognitively comparable to modern humans. However, many of these are ambiguously attributed as the dating interlaps with modern human presence in Europe.
- Personal adornment
Neanderthal are known to have used ochre—red-, yellow-, or black-pigmented manganese and iron oxide pieces—which has been hypothesised to have functioned as body paint. Ochre is well-documented from 60–45 kya in Neanderthal sites, with the earliest example dating to 250–200 kya (similar to the ochre record of H. sapiens). However, modern hunter gatherers, in addition to body paint, also use ochre for medicine, tanning hides, as a food preservative, and as an insect repellent, so its use as paint for Neanderthals is speculative. Nonetheless, in support of the paint hypothesis, containers apparently used for mixing ochre pigments were found in Cioarei Cave, Romania, a geode from the same cave was coated with red ochre about 50 kya; and analyses of pigments from Pech de l’Azé, France, indicates they were applied to soft materials (such as a hide or human skin).
Neanderthals are known to have collected uniquely shaped objects and are suggested to have modified them into pendants, such as a fossil Aspa marginata shell possibly painted red from Fumane Cave, France, transported over 100 km (62 mi) to the site about 47.5 kya; 3 shells, dated to about 120–115 kya, perforated through the umbo belonging to Acanthocardia, Glycymeris, and Spondylus from Cueva de los Aviones, Spain, the former two associated with red and yellow pigments, and the latter a red-to-black mix of hematite and pyrite; a Pecten shell with traces of an orange mix of goethite and hematite from Cueva Antón, Spain. The discoverers of the latter two claim that pigment was applied to the exterior to make it match the naturally vibrant inside coloration. Excavated from 1949–1963 from the French Grotte du Renne, Châtelperronian beads made from animal teeth, shells, and ivory were found associated with Neanderthal bones, but the dating is uncertain and Châtelperronian artefacts may actually have been crafted by modern humans and simply redeposited with Neanderthal remains.
Neanderthals are suggested to have used various bird parts as artistic mediums. In a 2012 study examining 1,699 ancient sites across Eurasia, raptor and corvid bones, species not typically consumed by any human society, were argued to show evidence of feather plucking, specifically of the large flight feathers. The authors used this as evidence of bird feathers being worn as personal adornment. In 2015, a study argued that a number of 130 ka eagle talons found in a cache near Krapina, Croatia, associated with Neanderthal bones had been modified to be used as jewellery. A similar 39 ka Spanish imperial eagle talon necklace was reported in 2019 at Cova Foradà in Spain, though from the contentious Châtelperronian layer. In 2017, incision-decorated raven bones from the Zaskalnaya VI (Kolosovskaya) Neanderthal site (Crimea, Ukraine) Micoquian industry dated to 43–38 kya were reported. Given there are 17 of these objects at seven different sites in the area, and the notches on all of them are more-or-less equidistant to each other, they are very unlikely to have originated from simple butchering.
Discovered in 1975, the so-called Mask of la Roche-Cotard, a mostly flat piece of flint with a bone pushed through a hole on the midsection—dated to 32, 40, or 75 kya—has been purported to resemble the upper half of a face, with the bone representing eyes. It is contested whether it represents a face, or if it even counts as art. In 1988, American archaeologist Alexander Marshack speculated that a Neanderthal at Grotte de L'Hortus, France, wore a leopard pelt as personal adornment to indicate elevated status in the group based on a recovered leopard skull, phalanges, and tail vertebrae.
- Abstract art
Neanderthals are also proposed to have produced abstract art pieces. In 2012, deep scratches on the floor of Gorham's Cave, Gibraltar, were discovered, dated to older than 39 kya, which the discoverers have interpreted as Neanderthal abstract art. The scratches could have also been produced by a bear.
In 2018, some red-painted dots, disks, lines, and hand stencils on the cave walls of the Spanish La Pasiega, Maltravieso, and Doña Trinidad Caves were dated to be older than 66 kya, at least 20 ka prior to the arrival of modern humans in Western Europe. This would indicate Neanderthal authorship, and similar iconography recorded in other Western European sites—such as Les Merveilles, France, and Cave of El Castillo, Spain—could potentially also have Neanderthal origins. However, the dating of these Spanish caves, and thus attribution to Neanderthals, is contested.
Also in 2018, an engraved flint flake was found in the grave of a Neanderthal child in Crimea, Ukraine.
Purported Neanderthal bone flute fragments made of bear long bones are reported from Potok Cave, Slovenia, in the 1920s, and Istállóskö Cave, Hungary, and Mokriška Jama Cave, Slovenia, in 1985; but these are now attributed to modern human activities. The 1995 140–42 ka Divje Babe Flute from Slovenia has been attributed to Neanderthals, and Canadian musicologist Robert Fink said the original flute had either a diatonic or pentatonic musical scale. Alternatively, it has also been claimed that the holes were made by a scavenging hyaena as there are a lack of cut marks stemming from whittling, but it is highly unlikely the punctures were made by teeth, and cut marks are not always present on bone flutes.
Despite the apparent 150 ka stagnation in Neanderthal innovation, there is evidence that Neanderthal technology was more sophisticated than was previously thought. However, the high frequency of potentially debilitating injuries could have prevented very complex technologies from emerging, as a major injury would have impeded an expert's ability to effectively teach a novice.
Neanderthals made stone tools, and are associated with the Mousterian industry. The Mousterian is also associated with North African H. sapiens as early as 315 kya and was found in Northern China about 47–37 kya. The Levallois technique they adopted (also not unique to Neanderthals) maximized the cutting surface with the least amount of flint. As a difficult-to-learn process, the technique may have been directly taught generation to generation rather than via purely observational learning. There is some debate if they had long-ranged weapons. A wound on the neck of an African wild ass was likely inflicted by a Levallois point javelin, and bone trauma consistent with habitual throwing has been reported in Neanderthals. Some spear tips from Abri du Maras, France, may have been too fragile to have been used as thrusting spears, possibly suggesting their use as darts.
Neanderthals may also be associated with the Châtelperronian 45–40 kya in central France and northern Spain, borrowing (or by process of acculturation) tool-making techniques from immigrating modern humans. The makers may have been a transitional culture between the Neanderthal Mousterian and the modern human Aurignacian. The Châtelperronian culture crafted bone tools and ornaments, and used grinding and polishing on the bones rather than the percussion technique used with stone. However, Neanderthal attribution of these artefacts is contested.
The Neanderthals in 10 coastal sites in Italy (namely Grotta del Cavallo and Grotta dei Moscerini) and Kalamakia Cave, Greece, are known to have crafted scrapers using smooth clam shells, and possibly hafted them to a wooden handle. They probably chose this clam species because it has the most durable shell. At Grotta dei Moscerini, about 24% of the shells were gathered alive from the seafloor, meaning these Neanderthals had to wade or dive into shallow waters to collect them. At Grotta di Santa Lucia, Italy, in the Campanian volcanic arc, Neanderthals collected the porous volcanic pumice, which, for contemporary humans, was probably used for polishing points and needles. The pumices are associated with shell tools.
At Abri du Maras, France, twisted fibres associated with Neanderthals suggests that they produced string and cordage, and this technology was likely far more widespread than the archaeological record indicates, as the materials used to make them (such as animal hair, hide, sinew, or plant fibres) are biodegradable and preserve very poorly. This technology could indicate at least a basic knowledge of weaving and knotting, which could have made possible the production of nets, containers, packaging, baskets, carrying devices, ties, straps, harnesses, clothes, shoes, beds, bedding, mats, flooring, roofing, walls, and snares, and would have been important in hafting, fishing, and seafaring. The archaeological record shows Neanderthals commonly used animal hide and birch bark, and it is possible they used them to make cooking containers, though this is based largely on circumstantial evidence as neither fossilise well. It is possible the Neanderthals at Kebara Cave, Israel, used the shells of the spur-thighed tortoise as containers.
Fire and construction
Neanderthals were able to create fire, and utilise complex spatial organisation of their settlements, indicating equatable intelligence levels with contemporary humans. Certain areas in a settlement were used for specific activities, such as for knapping, butchering, hearths, and wood storage. Many Neanderthal sites lack evidence for such activity likely due to natural degradation of the area, such as by bear infiltration after abandonment of the settlement.
In a number of caves, evidence of hearths has been detected. Neanderthals likely considered air circulation when making hearths as a lack of proper ventilation for a single hearth can render a cave uninhabitable in several minutes. Abric Romaní rock shelter indicates eight evenly spaced hearths lined up against the rock wall, likely used to stay warm while sleeping, with one person sleeping on either side of the fire. At Cueva de Bolomor, with hearths lined up against the wall, the smoke flowed upwards to the ceiling, and led to outside the cave. In Grotte du Lazaret, smoke was probably naturally ventilated during the winter as the interior cave temperature was greater than the outside temperature; likewise, the cave was likely only inhabited in the winter.
In 1990, two 176 ka ring structures made of broken stalagmite pieces, several metres wide, were discovered in a large chamber more than 300 m (980 ft) from the entrance within Bruniquel Cave, France. One ring was 6.7 m × 4.5 m (22 ft × 15 ft) with stalagmite pieces averaging 34.4 cm (13.5 in) in length, and the other 2.2 m × 2.1 m (7.2 ft × 6.9 ft) with pieces averaging 29.5 cm (11.6 in). There were also 4 other piles of stalagmite pieces for a total of 112 m (367 ft) or 2.2 t (2.4 short tons) worth of stalagmite pieces. A team of Neanderthals was likely necessary to construct these, but the chamber's actual purpose is uncertain. Building complex structures so deep in a cave is unprecedented in the archaeological record, and indicates sophisticated lighting and construction technology, and great comfortability in subterranean environments.
Neanderthal produced the adhesive birch bark tar, perhaps using plant-based resins for hafting. It was long believed that birch bark tar required a complex recipe to be followed, and that it thus showed complex cognitive skills and cultural transmission. However, a 2019 study showed it can be made simply by burning birch bark on smooth vertical surfaces, such as a flat, inclined rock.
Neanderthals were likely able to survive in a similar range of temperatures as modern humans while sleeping: about 32 °C (90 °F) while naked in the open and windspeed 5.4 km/h (3.4 mph), or 27–28 °C (81–82 °F) while naked in an enclosed space. Since ambient temperatures were markedly lower than this—averaging during the Last Interglacial 17.4 °C (63.3 °F) in July and 1 °C (34 °F) in January and dropping to as a low as −30 °C (−22 °F) on the coldest days—they may have required tailored clothing capable of preventing airflow to the skin. Especially during extended periods of travelling (such as a hunting trip), tailored footwear completely enwrapping the feet may have been necessary.
However, as opposed to the bone sewing-needles and stitching awls of contemporary modern humans, the only known Neanderthal tools that could have been used to fashion clothes are hide scrapers, which could have made items similar to blankets or ponchos. However, Neanderthals appear to have been able to manufacture string, which could indicate weaving ability, and a naturally-pointed horse metatarsal bone from Cueva de los Aviones, Spain, was speculated to have been used as an awl, perforating dyed hides, based on the presence of orange pigments. Neanderthals would have needed to cover up most of their body, and contemporary humans would have covered 80–90%.
Since human/Neanderthal admixture is known to have occurred in the Middle East, and no modern body louse species descends from Neanderthals (body lice only inhabit clothed individuals), it is possible Neanderthals (and/or humans) in hotter climates did not wear clothes, or Neanderthal lice were highly specialised.
Remains of Middle Paleolithic stone tools on Greek islands indicate early seafaring by Neanderthals in the Ionian Sea possibly starting as far back as 200–150 kya. The oldest stone artefacts from Crete date to 130–107 kya, Cephalonia 125 kya, and Zakynthos 110–35 kya. Here, they likely employed simple reed boats and made one-day crossings back and forth. Other Mediterranean islands include Sardinia, Melos, Alonnisos, and Naxos (though Naxos may have been connected to land), and it is possible they crossed the Strait of Gibraltar. Their ability to engineer these boats and navigate through open waters speaks to their advanced cognitive and technical skills.
Given high trauma rates and evidence of healing, Neanderthals appear to have been well-equipped at handling severe injuries. Well-healed fractures on many bones indicate the setting of splints. Individuals with severe head and rib traumas (which would have caused massive blood loss) indicate they had some manner of dressing major wounds, and bandages could have been made from animal skin. By-and-large, they appear to have avoided severe infections, indicating good long-term treatment of such wounds.
Their knowledge of medicinal plants was comparable to contemporary humans. An individual at Sidrón Cave, Spain, seems to have been medicating a dental abscess using poplar—which contains salicylic acid, the active ingredient in aspirin—and there were also traces of the antibiotic-producing Penicillium chrysogenum. They may have also used yarrow and camomile, and their bitter taste—which should act as a deterrent as it could indicate poison—means it was likely a deliberate act. In Kebara Cave, Israel, plant remains which have historically been used for their medicinal properties were found, including the common grape vine, the pistachios of the Persian turpentine tree, ervil seeds, and oak acorns.
It was once thought that Neanderthals did not have language, and cognitive scientist Philip Lieberman declared that they were anatomically unable to produce quantal vowels, which are present in all modern human languages, because they had a large mouth and thus lacked the necessity for a descended larynx to fit the entire tongue inside the mouth. However, this is not a safe assumption to make, and the modern human vocal apparatus and thus vocal repertoire were likely already present in the ancestral H. heidelbergensis. The 1983 discovery of a Neanderthal hyoid bone—used in speech production in humans—in Kebara 2 which is almost identical to that of humans suggests Neanderthals were capable of speech. The prevailing hypothesis for a long time was that speech spontaneously developed very recently in modern humans, and Lieberman argued that the hyoid could have had a different usage in Neanderthals, as it is also used in tongue movement, including while chewing.
The degree of language complexity is difficult to establish, but given that Neanderthals achieved some technical and cultural complexity, and interbred with humans, it is reasonable to assume they were at least fairly articulate, comparable to modern humans. A somewhat complex language—possibly using syntax—was likely necessary to survive in their harsh environment, with Neanderthals needing to communicate about topics such as locations, hunting and gathering, and tool-making techniques.
Neuroscientist Andrey Vyshedskiy argued that Neanderthals lacked mental synthesis, the behaviorally modern human imaginative ability to craft effectively infinite ideas using a finite amount of words. This is a hallmark of behavioural modernity, which he believed spontaneously appeared by about 70 kya (the "Upper Paleolithic Revolution"). However, behavioural modernity is regarded as a process initiated as early as 400 kya, and may have also been exhibited in Neanderthals.
The FOXP2 gene in modern humans is associated with speech and language development. FOXP2 was present in Neanderthals, but not the gene's modern human variant. Neurologically, Neanderthals had an expanded Broca's area—operating the formulation of sentences, and speech comprehension—but 11 out of 48 genes which encode for language brainwaves had different methylation patterns between Neanderthals and modern humans. This could indicate a stronger ability in modern humans than in Neanderthals to express language.
Claims that Neanderthals held funerals for their dead with symbolic meaning:158–60 are heavily contested and speculative. Even if the burial was intentional, it is not indicative of a religious belief of life after death, as such burial could have been the result of great emotion or to prevent scavenging.
The debate on Neanderthal funerals has been active since the 1908 discovery of La Chapelle-aux-Saints 1 in a small, nonnatural hole in a cave in southwestern France, very controversially attributed to have been buried in a symbolic fashion. Another grave at Shanidar Cave, Iraq, was associated with the pollen of several flowers that may have been in bloom at the time of deposition—yarrow, centaury, ragwort, grape hyacinth, joint pine, and hollyhock. The medicinal properties of the plants led American archaeologist Ralph Solecki to claim that the man buried was some leader, healer, or shaman. However, it is also possible the pollen was deposited by a small rodent after the man's death.
The graves of children and infants, especially, are associated with grave goods such as artefacts and bones. The grave of a newborn from La Ferrassie, France, was found with three flint scrapers, and an infant from Dederiyeh Cave, Syria, was found with a triangular flint placed on its chest. A 10 month old from Amud Cave, Israel, was associated with a red deer mandible, likely purposefully placed there given other animal remains are now reduced to fragments. Teshik-Tash 1 from Uzbekistan was associated with a circle of ibex horns, and a limestone slab argued to have supported the head. A child from Kiik-Koba, Crimea, Ukraine, had a flint flake with some purposeful engraving on it, likely requiring a great deal of skill, and possibly made with some symbolic significance. Nonetheless, these contentiously constitute evidence of symbolic meaning as the grave goods' significance and worth are unclear.
It was once argued that the bones of the cave bear, particularly the skull, in some European caves were arranged in a specific order, indicating an ancient bear cult that killed bears and then ceremoniously arranged the bones. This would be consistent with bear-related rituals of modern human Arctic hunter gatherers, but the alleged peculiarity of the arrangement could also be well-explained by natural causes, and bias could be introduced as the existence of a bear cult would conform with the idea that totemism was the earliest religion, leading to undue extrapolation of evidence.
It was also once thought that Neanderthals ritually hunted, killed, and cannibalised other Neanderthals and used the skull as the focus of some ceremony. In 1962, Italian palaeontologist Alberto Blanc believed a skull from Grotta Guattari, Italy, had evidence of a swift blow to the head—indicative of ritual murder—and a precise and deliberate incising at the base to access the brain. He compared it to the victims of headhunters in Malaysia and Borneo, putting it forward as evidence of a skull cult. However, it is now thought to have been a result of cave hyaena predation. Though Neanderthals are known to have practiced cannibalism, there is unsubstantial evidence to suggest ritual defleshing.
Interbreeding with modern humans
The first Neanderthal genome sequence was published in 2010, and strongly indicated interbreeding between Neanderthals and early modern humans. The genomes of all non-sub-Saharan populations contain Neanderthal DNA. Various estimates exist for the proportion: 1–4% in modern Eurasians, 3.4–7.9%, and 1.8–2.4% in modern Europeans and 2.3–2.6% in modern East Asians. Such low percentages indicate infrequent interbreeding. Of the inherited Neanderthal genome, 25% in modern Europeans and 32% in modern East Asians may be related to viral immunity. In all, approximately 20% of the Neanderthal genome appears to have survived in the modern human gene pool.
However, due to their small population and resulting reduced effectivity of natural selection, Neanderthals accumulated several weakly harmful mutations, which were introduced to and slowly selected out of the much larger human population; the initial hybridised population may have experienced up to a 94% reduction in fitness compared to contemporary humans. By this measure, Neanderthals may have substantially increased in fitness. A 2017 study focusing on archaic genes in Turkey found associations with coeliac disease, malaria severity, and Costello syndrome. Nonetheless, some genes may have helped modern human Europeans adapt to the environment; the Val92Met variant of the MC1R gene, the most frequent variant associated with red hair and light skin, may descend from Neanderthals though this is contested as the variant was rare in Neanderthals, and light skin in modern humans did not become prevalent until the Holocene. Many genes related to the immune system appear to have been introgressed into modern humans, which may have aided migration, such as OAS1, STAT2, TLR6, TLR1, TLR10, and several related to immune response.[f]
According to linkage disequilibrium mapping, the last Neanderthal gene flow into the modern human genome occurred 86–37 kya, but most likely 65–47 kya. However, interbreeding still occurred without contributing to the modern genome. The approximately 40 ka old modern human Oase 2 was found, in 2015, to have had 6–9% (point estimate 7.3%) Neanderthal DNA, indicating a Neanderthal ancestor up to four to six generations earlier, but this hybrid Romanian population does not appear to have made a substantial contribution to the genomes of later Europeans. In 2016, the DNA of Neanderthals from Denisova Cave revealed evidence of interbreeding 100 kya, and interbreeding with an earlier dispersal of H. sapiens may have occurred as early as 120 kya in places such as the Levant. The earliest H. sapiens remains outside of Africa occur at Misliya Cave 194–177 kya, and Skhul and Qafzeh 120–90 kya. However, the Neanderthals of the German Hohlenstein-Stadel Cave have deeply divergent mtDNA compared to more recent Neanderthals, possibly due to introgression of human mtDNA between 316–219 kya, or simply because they were genetically isolated. Whatever the case, these first interbreeding events have not left any trace in modern human genomes.
Due to the absence of Neanderthal-derived mtDNA (which is passed on from mother to child) in modern populations, it has been suggested that the progeny of Neanderthal females who mated with modern human males were either rare, absent, or sterile—that is to say, admixture stems from the progeny of Neanderthal males with modern human females. Due to the lack of Neanderthal-derived Y-chromosomes in modern humans (which is passed on from father to son), it has also been suggested that the hybrids that contributed ancestry to modern populations were predominantly females, or the Neanderthal Y-chromosome was not compatible with H. sapiens and became extinct.
Detractors of the interbreeding model argue that the genetic similarity is only a remnant of a common ancestor instead of interbreeding, though this is unlikely as it fails to explain why sub-Saharan Africans do not have Neanderthal DNA. Anthropologist John D. Hawks has argued that the genetic similarity to Neanderthals may be the result of both common ancestry and interbreeding, as opposed to just one or the other.
Interbreeding with Denisovans
Though nDNA confirms that Neanderthals and Denisovans are more closely related to each other than they are to modern humans, Neanderthals and modern humans share a more recent maternally-transmitted mtDNA common ancestor, possibly due to interbreeding between Denisovans and some unknown human species. The 400 kya Neanderthal-like humans from Sima de los Huesos in northern Spain, looking at mtDNA, are more closely related to Denisovans than Neanderthals. Several Neanderthal-like fossils in Eurasia from a similar time period are often grouped into H. heidelbergensis, of which some may be relict populations of earlier humans, which could have interbred with Denisovans. This is also used to explain an approximately 124 ka old German Neanderthal specimen with mtDNA that diverged from other Neanderthals (except for Sima de los Huesos) about 270 kya, while its genomic DNA indicated divergence less than 150 kya.
Sequencing of the genome of a Denisovan from Denisova Cave has shown that 17% of its genome derives from Neanderthals. This Neanderthal DNA more closely resembled that of a 120 ka old Neanderthal bone from the same cave than that of Neanderthals from Vindija Cave, Croatia, or Mezmaiskaya Cave in the Caucasus, suggesting that interbreeding was local.
For the 90 ka old Denisova 11, it was found that her father was a Denisovan related to more recent inhabitants of the region, and her mother a Neanderthal related to more recent European Neanderthals at Vindija Cave, Croatia. The discovery of a first generation hybrid indicates interbreeding was very common between these species, and Neanderthal migration across Eurasia likely occurred sometime after 120 kya.
Neanderthals are thought to have died out between 41 and 39 kya. Though some Neanderthals in Gibraltar were dated to later than this—such as Zafarraya (30 kya) and Gorham's Cave (28 kya)—prompting a hypothesis of some Iberian refuge with the Ebro River providing a geographical barrier, these dates are likely incorrect as they were based on ambiguous artefacts instead of direct dating. A claim of Neanderthals surviving in a polar refuge in the Ural Mountains is loosely supported by Mousterian stone tools dating to 34–31 kya at a time when modern humans may not yet have colonised the northern reaches of Europe; however, modern human remains are known from the northern Siberian Mamontovaya Kurya site dating to 40 kya.
Whatever the cause of their extinction, Neanderthals were replaced by modern humans, indicated by near full replacement of Mousterian stone technology with modern human Aurignacian stone technology by 38 kya in the fossil record. Modern human remains dating to 45–43 kya have been found in Italy and Britain, and this migration of modern humans replaced Neanderthals. A 2019 reanalysis of 210 ka old skull fragments from the Greek Apidima Cave assumed to have belonged to a Neanderthal concluded that they belonged to a modern human, and DNA evidence indicates H. sapiens contact with Neanderthals and admixture as early as 100 kya, meaning there were multiple human immigration events into Europe. A Neanderthal skull dating to 170 kya from Apidima Cave indicates H. sapiens were replaced by Neanderthals until their return about 40 kya.
After reconstructing them as apelike in 1911, Boule concluded that Neanderthals were exterminated by invading modern humans. This was the prevailing theory on Neanderthal extinction until the middle of the century when Neanderthals were reconstructed as being more civilised in scientific thought. At this point, the killer ape theory was popularised, which states that modern humans evolved on a violent and war-driven path, committing genocide on the comparatively peaceful Neanderthals while colonising Europe. In 1992, Jared Diamond in his book The Third Chimpanzee said competitive replacement often occurs in human history when a more technologically advanced culture (modern humans) meets a less advanced culture (Neanderthals). However, there is a notable lack of Neanderthal/human violence in the archaeological record. To explain this, in 1999, military historian Azar Gat suggested that, instead of an overt genocide, modern humans used hostile demonstrations to scare Neanderthals off favourable living grounds, but still massacred them when these demonstrations were ineffective. Though peaceful interactions occurred, he maintained that aggressive ones were predominant, which led to their extinction.
The first evidence of Neanderthal/human contact was discovered in 2009 with a mandible belonging to a young Neanderthal from the modern-human-inhabited (indicated by Aurignacian technology) Les Rois Cave, France. The mandible shows cut marks which are similar to the butchery seen in the reindeer bones also in the cave, which could indicate human predation of Neanderthals, human skinning of Neanderthal heads (as trophies), or a pre-burial ritual involving tooth extraction. Pre-burial ritual is better supported as other Aurignacian sites have evidence of post-mortem tooth extraction (but for modern humans), perhaps to use as jewellery.
Shanidar 3 died from complications from a stab wound, likely originating from a light-weight, long-range projectile, a technology that possibly only H. sapiens had, which implies Neanderthal/modern human violence. However, the Lower Paleolithic Schöningen spears and Neanderthal trauma consistent with habitual throwing could indicate they were familiar with ranged weapons.
Though modern human expansion and Neanderthal contraction are correlated, this may instead due to the competitive exclusion principle with modern humans outcompeting and outperforming Neanderthals rather than exterminating them. However, largely human-free tropical Asia was colonised by modern humans by 60 kya, meaning European colonisation was, for some reason, delayed, and, though colder climate may have influenced immigration speed, it is possible the presence of Neanderthal settlements inhibited modern human expansion for some time.
The spread of grasslands and open steppe with increasingly colder climate possibly favoured humans over Neanderthals; modern humans could push into colder areas with bigger game wearing their fitted clothes, which were more effective at insulating than Neanderthal ponchos; and raw material and animal remain sourcing in the southern Caucasus suggest that modern humans were able to use extensive social networks to acquire resources from a greater area in leaner times, whereas Neanderthals likely restricted themselves to more local sources since most of their stone artefacts were drawn from within 5 km (3.1 mi). Modern humans appear to have used more complex food extraction methods, whereas Neanderthals gathered what was abundant. Consequently, in especially lean times, any competition may have been devastating on relict Neanderthal communities.
Their ultimate extinction coincides with Heinrich event 4, a period of intense cold and dry climate causing their preferred forest landscape to give way to steppeland, and future Heinrich events are also associated with massive cultural turnovers where European human populations collapsed. This climate change may have depopulated several regions of Neanderthals, like previous cold spikes, but these areas were instead repopulated by immigrating humans, leading to Neanderthal extinction. However, it has also been proposed that climate change was the primary driver, as their low population left them vulnerable to any environmental change, with even a small drop in survival or fertility rates possibly quickly leading to their extinction. The Campanian Ignimbrite Eruption in Italy around 40 kya, when Neanderthal populations may have already been dwindling from other factors, could have led to their final demise, and produced a 2–4 °C cooling event for a year and acid rain for several more years.
Anthropologist Pat Shipman suggested that domestication of the wolf could have played a role in Neanderthals' extinction, or rather, a symbiosis with wolves long preceding domestication. She claims that modern humans, about 50–45 kya, evolved the whites of the eyes to allow for more effective non-verbal communications with wolves, and this gave modern humans an advantage in hunting. She also claims that Neanderthals did not have very prominent whites of the eyes, like the rest of the animal kingdom.:214–226
Modern humans may have introduced African diseases to Neanderthals, contributing to their extinction. Lacking immunity, compounded by an already low population, first contact may have been devastating to the Neanderthal population. Low genetic diversity may have also rendered fewer Neanderthals naturally immune to these new diseases.
Low population and inbreeding depression may have caused maladaptive birth defects, which could have contributed to their decline.
In late-20th-century New Guinea, due to cannibalistic funerary practices, the Fore people were decimated by transmissible spongiform encephalopathies, specifically kuru, a highly virulent disease spread by ingestion of prions found in brain tissue. However, individuals with the 129 variant of the PRNP gene were naturally immune to the prions. Studying this gene led to the discovery that the 129 variant was widespread among all modern humans, which could indicate widespread cannibalism at some point in human prehistory. Because Neanderthals are known to have practised cannibalism to an extent and to have co-existed with modern humans, British palaeoanthropologist Simon Underdown speculated that modern humans transmitted a kuru-like spongiform disease to Neanderthals, and, because the 129 variant appears to have been absent in Neanderthals, it quickly killed them off.
In popular culture
Neanderthals have been portrayed in popular culture including appearances in literature, visual media and comedy. The "caveman" archetype often mocks Neanderthals, and depicts them as primitive, hunchbacked, knuckle-dragging, club wielding, grunting, anti-social characters driven solely by animal instinct. "Neanderthal" can also be used as an insult.
In literature, they are sometimes depicted as brutish or monstrous, such as in H. G. Wells' The Grisly Folk and Elizabeth Marshall Thomas' The Animal Wife, but also civilised, such as William Golding's The Inheritors, Björn Kurtén's Dance of the Tiger, and Jean M. Auel's Clan of the Cave Bear and her Earth's Children series.
- Denisovan – Asian archaic human
- European early modern humans – Earliest anatomically modern humans in Europe
- Early human migrations
- Homo luzonensis – Archaic human from Luzon, Philippines
- Homo naledi – Small-brained South African archaic human
- Homo floresiensis – Archaic human from Flores, Indonesia
- After being mined for limestone, the cave caved in and was lost by 1900. It was rediscovered in 1997 by archaeologists Ralf Schmitz and Jürgen Thissen
- The German spelling Thal ("valley") was current until 1901 but has been Tal since then. (The German noun is cognate with English dale.) The German /t/ phoneme was frequently spelled th from the 15th to 19th centuries, but the spelling Tal became standardized with the German spelling reform of 1901 and the old spellings of the German names Neanderthal for the valley and Neanderthaler for the species were both changed to the spellings without h.
- In Mettmann, Neander Valley, there is a local idiosyncrasy in use of the outdated spellings with th, such as with the Neanderthal Museum (but the name is in English [German would require Neandertalermuseum]), the Neanderthal station (Bahnhof Neanderthal), and some other rare occasions meant for tourists. Beyond these, city convention is to use th when referring to the species.
- King made a typo and said "theositic"
- The bones were discovered by workers of Wilhelm Beckershoff and Friedrich Wilhelm Pieper. Initially, the workers threw the bones out as debris, but Beckershoff then told them to store the bones. Pieper asked Fuhlrott to come up to the cave and investigate the bones, which Beckershoff and Pieper believed belonged to a cave bear.
- OAS1 and STAT2 both are associated with fighting viral inflections (interferons), and the listed toll-like receptors allow cells to identify bacterial, fungal, or parasitic pathogens. African origin is also correlated with a stronger inflammatory response.
- Homo floresiensis originated in an unknown location from unknown ancestors and reached remote parts of Indonesia. Homo erectus spread from Africa to western Asia, then east Asia and Indonesia; its presence in Europe is uncertain, but it gave rise to Homo antecessor, found in Spain. Homo heidelbergensis originated from Homo erectus in an unknown location and dispersed across Africa, southern Asia and southern Europe (other scientists interpret fossils, here named heidelbergensis, as late erectus). Modern humans spread from Africa to western Asia and then to Europe and southern Asia, eventually reaching Australia and the Americas. In addition to Neanderthals and Denisovans, a third gene flow of archaic Africa origin is indicated at the right. Chart is missing superarchaic (which diverged from erectus 1.9 mya) introgression into Neanderthal/Denisovan common ancestor.
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