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Why Spider Monkeys Only Have Four Fingers

4,200 Visualizzazioni· 12/19/17
Smithsonian Channel
Smithsonian Channel
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1,606

Unlike virtually every other primate, spider monkeys have no thumbs, which could snag on the branches. Instead, their four long fingers form a perfect hook to help them swing on branches. From the Series: Amazing Monkeys: The Americas http://bit.ly/2y7TQ5Y

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