Female Ducks’ Twisty Tracts Defend Against Screwy Males

Female Muscovy ducks have evolved a convoluted mechanism for keeping unwanted males at bayAn extraordinary sexual arms race that has played out in duck ponds for thousands of years has been uncovered by evolutionary biologists.Faced with unwelcome advances from undesirable males wielding large, corkscrew-shaped penises, the females have gone on the defensive.The solution - the result of millennia of evolution - arrived in the form of vaginas that spiral in the opposite direction, so thwarting uninvited males at a stroke.Some female ducks possess genitalia of labyrinthine complexity, with kinks, dead ends and hairpin bends, according to a report in the journal Proceedings of the Royal Society.Patricia Brennan, professor of evolutionary biology at Yale University in New Haven, Connecticut, decided to investigate the peculiar co-evolution of male and female duck genitalia after previous work revealed stark differences between species.In some, the males aggressively pursue and attempt to mate with females that ar

Female Ducks’ Twisty Tracts Defend Against Screwy Males

The first intimate duck videos show that it's mate and checkmate in the battle of the sexes. High-speed cameras document that a male Muscovy duck can fully extend his 20-centimeter penis in ...

Wed 23 Dec 09 from Wired Science

Sexual conflict takes shape in ducks

Anatomy differences, other clues suggest coevolution of traits

Wed 23 Dec 09 from ScienceNews

Researchers reveal secrets of duck sex: It's all screwed up

Female ducks have evolved an intriguing way to avoid becoming impregnated by undesirable but aggressive males endowed with large corkscrew-shaped penises: vaginas with clockwise spirals that ...

Wed 23 Dec 09 from Phys.org

Yale researchers reveal secrets of duck sex: It's all screwed up, Wed 23 Dec 09 from Biology News

Featured - Researchers reveal secrets of duck sex: It's all screwed up, Thu 24 Dec 09 from Labspaces.net

Yale Researchers Reveal Secrets Of Duck Sex: It's All Screwed Up, Wed 23 Dec 09 from RedOrbit

Kinkiness Beyond Kinky

There comes a time in every science writer’s career when one must ...

Tue 22 Dec 09 from Discover Magazine

How One Odd Duck Says 'No' to Sex

Female ducks have oddly shaped vaginas to keep out unwanted males.

Wed 23 Dec 09 from Livescience

Video reveals twists and turns of genital warfare in ducks

Female Muscovy ducks have evolved a convoluted mechanism for keeping unwanted males at bayAn extraordinary sexual arms race that has played out in duck ponds for thousands of years has been ...

Wed 23 Dec 09 from Guardian.co.uk

Female ducks able to thwart forced sex

NEW HAVEN, Conn., Dec. 23 (UPI) -- Female ducks likely developed vaginas with clockwise spirals to prevent fertilization from aggressive males, scientists in Connecticut said.

Wed 23 Dec 09 from UPI

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