In this week’s Today I Learned, National Geographic explorer Helle Olsen explains why mandrills have such colorful bums. Turns out the bright red and blue on a male mandrill’s backside really draws the eye – especially the ladies’. Only dominant, top males flaunt such vibrant hues, and female mandrills see them as a badge of fitness.
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TIL: Why Do These Monkeys Have Big, Colorful Butts? | Today I Learned