Robert Clarkのインスタグラム(robertclarkphoto) - 7月1日 05時50分

The hand of a gorilla. Despite the fact that humans are bipedal and gorillas usually walk on all four limbs, the two species hands are closer in proportion to each other then those of any other ape, including #HomoSapien's closer relative, the tool using #chimpanzee.
According to a recent study, one reason for this may be tied to the fact that both gorillas and humans use their hands (cupped in #gorillas, clenched in humans) for ritualized aggressive displays and attack, unlike other apes. The similar structure or may be an example of parallel #evolution.
words by #JoeWallace.

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