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Time and again humans have domesticated wild animals, producing tame individuals with softer appearances and more docile temperaments, such as dogs and guinea pigs. But a new study suggests that one of our primate cousins--the African ape known as the bonobo --did something similar without human involvement.

We "naked apes" aren't as hirsute as our primate cousins. We still have an ape-like density of hair follicles--but we sprout out peach fuzz, instead of a thick coat. Those downy hairs may be more than an evolutionary leftover, though