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[Postscript: I tell Brennan’s story in more detail in my new book, .

It opens the chapter on sex–where I show how the same processes that explain these strange genitalia explain many other things in the natural world.] Reference: Patricia L.

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.

documentary, starting at about minute .) In brief, Brennan wanted to understand why some ducks have such extravagant penises. Why do they get so ridiculously long–some cases as long as the duck’s entire body?

Brennan discovered that female ducks have equally weird reproductive tracts (called oviducts).

Brennan suspects that female ducks slow down males trying to force a mating, but they can also let their partner’s penis move faster through the oviduct.

Before its emergence, a drake’s penis is usually completely hidden from view, tucked inside his body like an inside-out sock.

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.

In mammals, the penis becomes erect as blood flows into the spongy tissue. And as the fluid enters the penis, it does not simply become engorged. Unable to film duck penises in a real female oviduct, she built a fake oviduct out of silcone. But the overwhelming force of the explosive penis broke the fake oviduct. Her new fake oviducts were strong enough to handle the drakes, and she started filming. As Brennan had predicted, the counterclockwise turns of an oviduct slow down the expansion of the duck penis, compared to a straight tube or a clockwise one.

There comes a time in every science writer’s career when one must write about glass duck vaginas and explosive duck penises. To err on the side of caution, I am stuffing the rest of this post below the fold. And I would imagine that the sight of spiral-shaped penises inflating in less than a third of second might be considered in some quarters to be not exactly safe for work. As Brennan dissected duck penises, she began to wonder what the female sexual anatomy looked like.

My tale is rich with deep scientific significance, resplendent with surprising insights into how evolution works, far beyond the banalities of “survival of the fittest,” off in a realm of life where sexual selection and sexual conflict work like a pair sculptors drunk on absinthe, transforming biology into forms unimaginable. If you have a car like this, she said, what kind of garage do you park it in?But Brennan didn’t actually know how duck penises actually moved through the labirynthine oviduct, and how the oviduct’s shape might affect the drake’s delivery of sperm.

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