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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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Among lesser scaup and ruddy ducks, the regrowth varies in length or timing depending on whether males have to compete with a bunch of other guys, said Patricia Brennan of Yale University. Her new measurements offer the first evidence in vertebrates that social circumstances influence penis growth, she reported July 29 at the annual meeting of the Animal Behavior Society. Ducks typically do, their penises sometimes reaching considerable lengths 9.

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We, humans, may not be endowed by nature with great physical abilities: powerful muscles or weaponry like fangs, claws, horns and so on. I'm not talking about sexual activity - at it has been proved that bonobo which is also wrongly named "dwarf chimpanzee" has more sex and much varied than the human being - but about penis size. Gorilla males, which dwarf humans in size, have minute penises compared to ours, no thicker and longer than a pencil.

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Developing bird embryos do have penis precursors, it turns out, but a genetic signal causes the penis cells to die off during gestation. Namely, a penis. With a few exceptions such as ostrichesducksand geesemale land fowl have no external sex organs.

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Duck sex is an important scholarly endeavor. If not directly tailored to benefit the public interest, they argue, defund at all costs. This assault has already led to a short-lived ban on National Science Foundation funding for political science work not expressly devoted to "national security" and "economic interests.

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By Harry Pettit For Mailonline. Male ducks are infamous for their bizarre penises, which are corkscrew-shaped, exceptionally long and develop anew each year. Researchers have now found that the size of a male duck's penis changes when he hangs out with rivals.

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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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All rights reserved. Male ruddy ducks like the one shown here develop penises that run almost the length of their bodies, but dominant males grow even larger ones when mating competition is around. Patricia Brennan strolls through an outdoor aviary with a net in hand.

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Patricia Brennan from Yale University is trying to encourage male Muscovy ducks to launch their ballistic penises into test tubes. Normally, the duck keeps its penis inside-out within a sac in its body. The whole process takes just a third of a second and Brennan captures it all on high-speed camera.

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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. Sea slugs are "simultaneous hermaphrodites," meaning they possess both male and female genitals and use both during intercourse.

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