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New findings shed light on origin of upright walking in human ancestors: 4.5 million-year old fossil shows evidence of greater reliance on bipedalism than previously suggested

The oldest distinguishing feature between humans and our ape cousins is our ability to walk on two legs - a trait known as bipedalism. Among mammals, only humans and our ancestors perform this atypical balancing act. New research provides evidence for greater reliance on terrestrial bipedalism by a human ancestor than previously suggested in the ancient fossil record.

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