Yale researchers reveal secrets of duck sex: It's all screwed up (page 2)

Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that thwart oppositely spiraled males. read more

Yale researchers reveal secrets of duck sex: It's all screwed up

Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that ...

Wed 23 Dec 09 from Science Blog

Yale researchers reveal secrets of duck sex: It's all screwed up, Wed 23 Dec 09 from e! Science News

Yale researchers reveal secrets of duck sex: It's all screwed up, Wed 23 Dec 09 from Eurekalert

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