Why Spider Monkeys Only Have Four Fingers

From the creator

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

Published 2017-12-19 · Watch on YouTube ↗
Availability and playback restrictions are controlled by the original channel.