Why Spider Monkeys Only Have Four Fingers

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

Source: Smithsonian Channel, https://www.youtube.com/watch?v=uQ1XUz2Me-I
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