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What Monkey Has a Red Butt — Do You Know?

All primates, including monkeys, apes, and humans, have excellent color vision. This has led to monkeys using color, including colorful bottoms, in order to communicate non-verbally to other monkeys. There are several monkeys with red or dark pink butts, including baboons, mandrils, Japanese macaques, Rhesus macaques, Celebes crested macaques, and chimpanzees.   What Monkey Has …

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