The stripes of a zebra, the ornamentation of a waxbill, the elaborate ears of a Grevy’s zebra, the bright skin of a mandrill, or the facial patterns among Blue Monkeys are not simply beautiful objects. They are products of evolutionary dialogue. Every contour has been shaped by millions of years of selection, communicating information about fitness, identity, reproductive status, aggression, camouflage, or species recognition.

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