NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Primate skulls. From left to right are: Proconsul sp., an extinct primate that lived between 23 and 5 million years ago; Homo heidelbergensis (Broken Hill 1 skull, from Zambia), which lived between 600,000 and 250,000 years ago; and Homo neanderthalensis (Gibraltar 1, from Forbes Quarry), which lived between 230,000 and 29,000 years ago.
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