The sharp contrast provides butterflies with a material evolutionary advantage, because when their wings are open they can attract a mate, while when their wings are closed they can disappear on the trunk of a tree. It’s a bit of a cliché to refer to someone as a chameleon: a person who can change his colors from environment to environment. In fact, not one in a million can do that. But there are tens of thousands of butterflies: men and women like Eve with two dramatically different colorings—one which serves to attract and the other which serves to camouflage—and which can be switched at the
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