For 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.
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10 months ago 00:03:18 1
Meet the Penis-Fencing Flatworm | The Mating Game | BBC Earth
2 years ago 00:03:05 1
Meet the penis-fencing flatworm | The Mating Game – BBC