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World's Weirdest - Flatworm Penis Fencing

World's Weirdest: Freaks in the Ocean : SUN OCT 14 at 3P et/pt : http://animals.nationalgeographic.com/animalsFor flatworms, "Who's your daddy?" is a loaded question. In a bizarre bout lasting up to an hour, the first flatworm to stab and inseminate its mate becomes the father.
Length: 02:08

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