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Neanderthals (niˈændə(r)ˌtɑːl,neɪ-,-ˌθɑːl; Homo neanderthalensis or H. sapiens neanderthalensis), also written as Neandertals, are an extinct species or subspecies of archaic humans who lived in Eurasia until about 40,000 years ago. The reasons for Neanderthal extinction are disputed. Theories for their extinction include demographic factors such as small population size and inbreeding, competitive replacement, interbreeding and assimilation with modern humans, climate change, disease, or a combination of these factors. It is unclear when the line of Neanderthals split from that of modern humans; studies have produced various intervals ranging from 315,000 to more than 800,000 years ago. The date of divergence of Neanderthals from their ancestor H. heidelbergensis is also unclear. The oldest potential Neanderthal bones date to 430,000 years ago, but the classification remains uncertain. Neanderthals are known from numerous fossils, especially from after 130,000 years ago. The type specimen, Neanderthal 1, was found in 1856 in the Neander Valley in present-day Germany. For much of the early 20th century, European researchers depicted Neanderthals as primitive, unintelligent, and brutish. Although 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 was quite sophisticated. It includes the Mousterian stone-tool industry and ability to create fire and build cave hearths, make adhesive birch bark tar, craft at least simple clothes similar to blankets and ponchos, weave, go seafaring through the Mediterranean, and make use of medicinal plants, as well as treat severe injuries, store food, and use various cooking techniques such as roasting, boiling, 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.

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