JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Fossilised teeth, Sima de los Huesos. These teeth were found at Sima de los Huesos (Pit of Bones) and are the most found for any human species, world-wide. The teeth belong to Homo heidelbergensis and date back 400,000 years. Sima de los Huesos is one of several archaeological sites in Sierra de Atapuerca, Spain, that have been studied on and off over the past century, leading to a massive advancement in the understanding of human evolution. In 2000, Sierra de Atapuerca was made a world heritage site by UNESCO.
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