Lucky for you, I just did. If you saw the title of this story you figured it would be about duck cocks, you are one clairvoyant motherfucker.
Female ducks have evolved "maze-like" genitals with many twists, pouches and dead ends, in a bid to prevent rape and retain control of who fathers their offspring – while male ducks have evolved equally convoluted penises to keep up.Now I know what you're thinking "but I took Dino Bio" and "dinosaurs, like their avian descendents, had a on size fits all- purpose, muliti-use hole to exchange genenetic information - the cloaca." Most birds do, except for ducks. Because
Ducks, especially mallards, are one of the few species of birds in which males will often rape females...In fact, of the 40 per cent of matings which are a result of forced copulations, only around four per cent are successful.4 out of 10 matings, not just 4/10 female ducks, but matings in the duck world are rapes? Guess those crazy, maze-like vaginas come in handy!
Duck boy part on the right, girl part on the left
Full link here: http://www.cosmosmagazine.com/node/1277
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