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Ancient bones confirm earliest-known human ancestor walked upright.

What may be the earliest-known human ancestor, an ape-man called Sahelanthropus tchadensis who lived in Africa roughly 7 million years ago, walked upright for much of the time, according to a new study. 

The findings suggest that the ability to walk upright — known as bipedalism — occurred very early on the human family tree and reinforce the idea that it may be an evolutionary hallmark of our lineage.

The study by Guy and his colleagues, published Wednesday in the journal Nature, is based on a reassessment of three fossilized limb bones — a femur from a thigh and two ulnas from forearms — found in Chad’s Djurab Desert on the southern edge of the Sahara more than 20 years ago.

Source: www.nbcnews.com

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