This movie shows the explosive eversion of the male duck penis in air. The male is threading on top of a female. The male cloaca is seen on the top left. The high-alacrity video is 250 frames/second and the entire eversion of the 20 cm penis occurs in 0.35 sec. AS featured in the paper: Explosive eversion and functional morphology of the duck penis supports sexual conflict in waterfowl genitalia published in Proceedings of the Royal Society B.

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