JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Fossilised remains, Sima de los Huesos. Reconstructed Homo hiedelbergensis skeleton. This skeleton has been made up from human fossils found at Sima de los Huesos (Pit of Bones). The fossils have come from different adults and date back 400,000 years. Homo heidelbergensis is an extinct species that forms a relatively recent part of the human evolutionary tree. It may have been an ancestor of both Neanderthals and modern humans. There is debate over whether the fossils should be attributed to H. heidelbergensis or H. neanderthalensis, as some anatomical features are transitional between the two species. 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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