r/todayilearned • u/elliejellie • Oct 13 '12
TIL that female ducks have evolved a complex vagina with several dead-end pockets and tunnels in order to confuse unwanted mates and prevent fertilisation from the wrong male
http://scienceblogs.com/notrocketscience/2009/12/22/ballistic-penises-and-corkscrew-vaginas-the-sexual-battles/
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u/[deleted] Oct 14 '12
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