JOHN READER / SCIENCE PHOTO LIBRARY JOHN READER / SCIENCE PHOTO LIBRARY
Homo habilis jaw fragment. Lower jaw fragment from Homo habilis specimen OH 13, nicknamed Cindy. This specimen is estimated to be 1.6 million years old. H. habilis is thought to have lived approximately 2 to 1.6 million years ago, and had a brain size just less than half that of modern humans. The name Homo habilis means 'handy man', adopted because the species used primitive stone tools. OH 13 was excavated from Olduvai Gorge, Tanzania, in 1963, by Mary Leakey.
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