Australopithecus Afarensis better known as Lucy is believed to have walked the Earth 3.2 million years ago in Africa, and scientists based their model on a skeleton discovered in Ethiopia in 1974.
Researchers have long argued over when our ancestors 'came down out of the trees' , with arguments centering around Lucy, and whether her feet allowed her to climb as well as walk. Now, scientists studying the feet of Ugandan hunters who climb for honey say they believe Lucy may have spent time in both the trees and on the ground, the Daily Mail reported.
Many researchers view terrestrial bipedalism, the ability to walk on two legs on the ground, as the hallmark of 'humanness' as most of our living primate relatives — the great apes, specifically — still spend their time in the trees.
The fossil record shows that our predecessors lived in trees — until Lucy arrived on the scene — and it was her knee joint that led to the discovery that Lucy was one of the first bipeds.
"Australopithecus afarensis possessed a rigid ankle and an arched, nongrasping foot," wrote Nathaniel Dominy and his co-authors in Proceedings of the National Academy of Sciences. "These traits are widely interpreted as being functionally incompatible with climbing and thus definitive markers of terrestriality ," said Dominy, an associate professor of anthropology at Dartmouth.
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