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MAURICIO ANTON/SCIENCE PHOTO LIBRARY
Female Homo habilis. Artist's impression of a female Homo habilis holding her young and plucking fruit from a tree. H. habilis was an ancestor of modern humans that lived between around 2.1 and 1.6 million years ago. "Habilis" means "handy", and refers to the supposed tool-making abilities of these hominids. Their brains were small though, with a cranium volume of around 700 cubic centimetres (compared to around 1350cc for modern humans).