Photo: Human, Chimp Ancestors May Have Mated, DNA Suggests

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A reconstruction of the head of the Toumaï species, or Sahelanthropus tchadensis, is superimposed on a photograph of Botswana's Okavango Delta. Touma‹ is thought to have lived during a time when early human ancestors and chimp ancestors may have been interbreeding, a new study suggests.

Illustration from AFP/Getty Images

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