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Mary Roach is very very awesome.
Did you know that ducks are little rapists? It's true! Male ducks routinely rape female ducks. Female duck anatomy has evolutionarily responded by giving them strangely shaped vaginas with lots of dead-ends. When being raped, the female duck can "receive" the male's penis in a "wrong" part of the vagina, where it's impossible to fertilize her eggs.
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