How Chickens Lost Their Penises (And Ducks Kept Theirs)

If you’ve never seen a duck penis before, have a look at the infamous video above. That long corkscrew belongs to a Muscovy duck, and it’s typical of the group. Some ducks have helical penises that are longer than their entire bodies. But forget the helical shape, the size, and the surprisingly explosive extension—the weirdest thing about a duck’s penis is that it has one.

Most birds don’t. There are almost 10,000 species of birds and only around 3 percent of them have a penis. These include ducks, geese and swans, and large flightless birds like ostriches and emus. But eagles, flamingos, penguins and albatrosses have completely lost their penises. So have wrens, gulls, cranes, owls, pigeons, hummingbirds and woodpeckers.

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