KENNIS AND KENNIS / MSF / SCIENCE PHOTO LIBRARY KENNIS AND KENNIS / MSF / SCIENCE PHOTO LIBRARY
Sahelanthropus tchadensis skull. Artwork of a reconstruction of the Toumai skull, one of only a small number of fossils of the hominin Sahelanthropus tchadensis. This extinct species existed around 7 million years ago. It may form part of the earliest branches of the human evolutionary tree, but may date from before the divergence that led to chimpanzees and humans. The Toumai fossil was discovered in Chad in 2001.
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