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. (02:16)
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. (02:16)
