JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Prehistoric bison skull. The two European bison species, both hunted by prehistoric humans, are the European bison (Bison bonasus) and the extinct steppe bison (Bison priscus). This skull was found in the Trinchera Galeria, a cave in the Sierra de Atapuerca foothills near Burgos, Spain. The remains found here are between 200,000 and 400,000 years old. The limestone caves in these hills, containing many prehistoric fossils and artefacts, have been designated a UNESCO World Heritage Site.
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