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Erismatura vittata Philippi[2]. The lake duck Oxyura vittata is a small, South American stiff-tailed duck. It is also called the Argentine blue-billArgentine blue-billed duck[2] Argentine lake duckor Argentine ruddy duck.

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This page has been archived and is no longer updated. Published online 23 December Nature doi Matt Kaplan.

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Procreating is serious business in the animal kingdom, and Mother Nature has gone out of her way to cleverly ensure the survival of her many, many denizens. From sex organs with multiple heads to prodigious shafts exceeding an animal's own body length, here are 12 of the weirdest and often scariest animal penises on the planet:. But what makes this soft-bodied marine mollusk particularly different is its ability to grow a new penis within 24 hours.

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The shape of the duck penis and the shape of the duck vagina mean they go at it in an extremely unusual way. Well the way they go at it is rather unsightly, but the mechanics of duck sex is quite interesting. Female ducks have long twisted vaginas that have a number of spirals, however, the female duck vagina also has some dead-end pockets that they can engage if they do not want to be fertilised by the male duck that is mounting them.

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Male muscovy ducks, for example, have corkscrew-shaped penises that spring out from their body in less than half a second and are 20cm long when erect. Other species' length varies from 1. They twist in the opposite direction to the male duck's penis.

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The male Argentine Lake Duck and his North American scientists have discovered the longest bird penis ever - a Dr Kevin McCracken of the University of Alaska, Fairbanksand colleagues, report in this week's Nature that they have found a specimen of the Argentine lake duck Oxyura vittata that has a penis as long as its body - nearly half a metre long.

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There are only a few species of birds that have penises. Ducks, which are among them, have earned a reputation for having some of the most bizarre genitalia of all—corkscrew-shaped penises and complex vaginas with dead ends and false passages. Some duck penises are relatively massive.

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At some point in the species' history, female ruddy ducks decided blue bills were sexy, and evolution favored the flamboyant feature. But evolution just as carefully selected another extravagant male trait, which, at the time, was hidden: a long, corkscrew-shaped penis. In his new book, "Nature's Nether Regions" Viking,Schilthuizen takes a sweeping look across the animal kingdom — from ducks to hermaphroditic snails that have sex all day to sharks that use one of their penises, or "claspers," they have two to flush rival sperm out of the female's vagina — to illustrate an amazing diversity of genitalia that has been largely unappreciated, even among scientists.

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All rights reserved. Some ducks have helical penises that are longer than their entire bodies. There are almost 10, species of birds and only around 3 percent of them have a penis.

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Scientists study a plethora of structures in society, from skyscrapers and bridges to viruses and bacteria. They also study the structure of sex organs. A glorious example of this arms race revolves around a waterbird.

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