Mangabeys in a tree (IMAGE)
Caption
The researchers used sports-analysis software to compare the climbing movements of chimpanzees and mangabeys (pictured). They found that chimps support their greater weight when climbing down by fully extending their arms above their heads thanks to shallow, rounded shoulder joints and shortened elbow bones that are similar to those in humans. Mangabeys, which are built more like cats or dogs, have less flexibility and position their shoulders and elbows roughly the same when climbing up or down.
Credit
Luke Fannin, Dartmouth
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