A male Muscovy duck can fully extend his 20-centimeter penis in a third of second. The female duck can constrict her genitals to stop unwanted males siring her offspring.
Experts now believe that the corkscrew shaped genitals in certain waterfowl may have evolved through sexual conflict.
Info Source: Secrets of duck sex: Female Ducks’ Twisty Tracts Defend Against Screwy Males http://is.gd/6eeDL
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