As Evolutionary Battle Rages, Plugs Grow More Complex (IMAGE)
Caption
After mating, male butterflies excrete a pre-molded plug from intricate abdominal ducts that give the plug its complex shape. The plug hardens on the female, blocking her reproductive organs, but not the orifice she uses to lay eggs.
Credit
Ana Paula Carvalho
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Please credit Ana Paula Carvalho.
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