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.

CASE WESTERN RESERVE UNIVERSITY—The oldest distinguishing feature between humans and our ape cousins is our ability to walk on two legs – a trait known as bipedalism. New research led by a Case Western Reserve University School of Medicine professor of anatomy provides evidence for greater reliance on terrestrial bipedalism by a human ancestor than previously suggested in the ancient fossil record.

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