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Drakes unfurl their pensises differently than male mammals. A Muscovy drake everts his penis in about a third of a second, at speeds of 1.6 meters per second. Having made this video, Brennan still needed a way to see how a duck penis actually performs its appointed task.

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As I reported in 2007, Brennan discovered a pattern that supported this hypothesis.A female ducks’s partner, with her cooperation, can deliver sperm further up the oviduct.With the wanted and unwanted sperm delivered to different places in the oviduct, a female duck may be able to store the sperm in different pockets.With many examples of sexual conflict in nature, Brennan wondered if sexual conflict between male and female ducks was giving rise to their weird genitals.Female ducks pair off with male partners for the breeding season, but they also get harrassed by other males, sometimes being forced to have sex (and sometimes dying from the attacks). And yet only 3 percent of the ducklings that female ducks produce come from such forced matings.Female ducks can’t stop an unwanted male from delivering his sperm, but the obstacles in their oviducts may give them control over what happens to that sperm.

The female ducks may use their oviducts to slow down the expanation of the penis, so that by the time the drake ejaculates, the sperm are delivered in the lower reaches of the oviduct.

And then she can choose which drake will father her duckling.

For all the explosiveness male ducks may display, it’s the female ducks that get the final say.

But while male duck penises twist clockwise, the female oviduct twists counterclockwise.

Brennan speculated that all this bizarre anatomy is the result of a peculiar form of evolution known as sexual conflict.

The drake climbs on top, and then the penis emerges.