Live Science
•80% Informative
Scientists made the discovery while watching videos of chimpanzees and sooty mangabey monkeys.
Chimps and may have developed flexible shoulder and elbow joints as a way to "counteract" the effects of gravity on their heavier lower bodies.
The study suggests flexible appendages had evolved by the time of the last common ancestor between chimps and humans, but after apes and monkeys diverged.
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