Photo: Chimp "Stone Age" Finds Are Earliest Nonhuman Ape Tools, Study Says

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Stone tools reportedly used by chimpanzees were excavated in Côte d'Ivoire's Taï National Park.

The 4,300-year-old tools push back chimpanzee tool-use thousands of years, and cast into doubt the long-standing theory that direct human ancestors were the only animals to independently develop stone tools.

Photograph courtesy Gerald Newlands/ PNAS

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