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Images: Humans vs. chimps at the gym

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• Why do humans walk on two legs? To save energy

July 23, 2007 1:25 PM PDT

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The University of California at Davis trained five chimps to walk upright and to "knucklewalk." They found that some of the chimps consumed less energy walking in these ways than on all fours. The study hopes to shed light on why human ancestors went two-legged some 10 million years ago.

Photo by Cary Wolinsky/UC Davis

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