Homo neanderthalensis, also known as Neanderthals, were a species of archaic humans who lived in Eurasia until about 40,000 years ago. They are our closest extinct human relatives, sharing a common ancestor with modern humans. Neanderthals were well-adapted to the cold climates of the Pleistocene epoch and had a robust physical build.
Neanderthals were skilled hunters and toolmakers, using a wide array of stone tools and hunting large game animals such as mammoths and bison. They also had a form of symbolic culture as evidenced by the presence of burial sites and the use of body ornamentation.
Modern humans of non-African descent carry a small percentage of Neanderthal DNA, indicating that interbreeding occurred between the two groups when they coexisted in Eurasia.
The reasons for the extinction of Neanderthals are still debated, but climate change, competition with modern humans, and other environmental factors may have played a role.