Photo: Chimps Dig Tubers, Tool Study Finds

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Using sticks (including these pictured), chimps on an African savanna dig up tubers, roots, and bulbs to eat, according to a new study. The finding—a first—may shed light on how early human ancestors survived transitions from food-rich forest to more arid regions.

Photographs by Michael Nichols/NGS (top) and courtesy Ugalla Primate Project (bottom)

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