MAURICIO ANTON / SCIENCE PHOTO LIBRARY MAURICIO ANTON / SCIENCE PHOTO LIBRARY
Male and female Homo habilis, artist's impression. H. habilis was an ancestor of modern humans that lived between around 2.1 and 1.6 million years ago. Their brains were small though, with a cranium volume of around 700 cubic centimetres (compared to around 1350cc for modern humans).
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