Duck Penis
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https://m.youtube.com/watch?v=nLXvojn5ZQ0
Перевести · 19.01.2011 · This is an educational video about the ducks' mating rituals and more specifically the shape of the duck penis…
https://metro.co.uk/2017/09/22/how-do-ducks-have-sex-with-their-corkscrew-shaped...
Перевести · 22.09.2017 · A male ducks penis exists within a sack in its body, and during sexual intercourse, the male’s penis becomes erect and ejects from the sack. At full length, the duck’s penis …
https://www.nationalgeographic.com/animals/article/duck-penis-size-social-group-study
Перевести · 20.09.2017 · Duck penises evolved their corkscrew shapes as a result of conflict with females. Brennan wondered whether competition among males could also influence their penis …
https://unrealfacts.com/lake-duck-largest-penis-relative-body-size
Перевести · 21.04.2020 · While most birds don’t have a penis, ducks are one of the few birds that do. The penis of the lake duck is a long corkscrew. When the penis …
https://m.youtube.com/watch?v=qwjEeI2SmiU
Перевести · 29.12.2009 · High speed video showing the explosive eversion of a duck penis in air. The 20 cm penis …
https://m.youtube.com/watch?v=zgpM9mXbX4M
Перевести · 26.10.2017 · I use recently published research to explain the impressive ways in which sexual selection has shaped duck penis …
https://www.discovermagazine.com/planet-earth/ballistic-penises-and-corkscrew-vaginas...
Перевести · 23.12.2009 · Duck penises (and those other birds) work in a different way to human ones. For a start, they are flexible when erect. Human penises stiffen thanks to an onrush of blood; for ducks, it’s lymph that does the job. Finally, human males get erections before having sex but drakes evert their penis …
https://m.youtube.com/watch?v=YsYa11yonzI
Перевести · 19.05.2016 · Ducks are one of the rare birds that actually has a penis. About Press Copyright Contact us …
https://jezebel.com/everything-about-duck-penises-is-interesting-5992668
Перевести · 28.03.2013 · Prum said the duck penis is a corkscrew whose direction runs counterclockwise. Female ducks, he said, have evolved a complex vagina also shaped like a …
https://en.m.wikipedia.org/wiki/Lake_duck
Family: Anatidae
Genus: Oxyura
Kingdom: Animalia
Species: O. vittata
The lake duck grows to 36–46 centimetres (14–18 in). Females weigh 510–700 grams (18–25 oz) and males 600–850 grams (21–30 oz). Males can be distinguished from Andean duck (Oxyura ferruginea), a similar species, by being smaller and having a flatter head.
Penis
The lake duck holds the Guinness World Recordfor having the largest avian reproductive organ, from …
The lake duck grows to 36–46 centimetres (14–18 in). Females weigh 510–700 grams (18–25 oz) and males 600–850 grams (21–30 oz). Males can be distinguished from Andean duck (Oxyura ferruginea), a similar species, by being smaller and having a flatter head.
Penis
The lake duck holds the Guinness World Record for having the largest avian reproductive organ, from a specimen in Córdoba, Argentina that had a penis measuring 42.5 centimetres (16.7 in). It also has the longest penis of any vertebrate in relation to body length. The penis, which is typically coiled up in flaccid state, can reach about the same length as the animal itself when fully erect, but more commonly is about half the bird's length. It has a soft tip and spiny base. It is theorized that the size of their spiny penises with bristled tips may have evolved in response to competitive pressure in these highly promiscuous birds, removing sperm from previous matings in the manner of a bottle brush.
Although most male birds have no penis, ducks have a long corkscrew penis, and the females have a long corkscrew vagina, which spirals in the opposite direction. The males often try to force copulation, but the complex mating geometry allows the females to retain control—most forced copulations do not result in successful fertilization.
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Male ruddy ducks like the one shown here develop penises that run almost the length of their bodies, but dominant males...Read MoreRead More
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Size matters when it comes to the social setting for some ducks, a new study finds.
Patricia Brennan strolls through an outdoor aviary with a net in hand. She scoops up a duck, turns it onto its back, and applies pressure to its belly. "If you know exactly where to press, you can pop the penis out," she explains. "They're quite cooperative. The males get used to being handled."
The biologist didn't plan to spend more than a decade coaxing ducks to reveal their genitals to her. It wasn't until the end of graduate school that she realized birds could have penises at all. And with good reason: the vast majority of birds – 97 percent – don't. Ducks are among the small minority that does.
Owing to an odd quirk in their physiology, ducks develop their penises anew each year. When the changing amount of daylight signals the start of breeding season, their genitals begin to grow. At the end of the breeding season, they shrink. But Brennan, who is based at Mount Holyoke College in South Hadley, Massachusetts, and her team have found that ducks’ social scene can have an effect too.
Duck penises evolved their corkscrew shapes as a result of conflict with females. Brennan wondered whether competition among males could also influence their penis development. To find out, she and her team sorted two species with very different mating systems, ruddy ducks and lesser scaups, either into pairs or into groups of five females and eight males, all housed in naturalistic outdoor aviaries.
The highly promiscuous ruddy ducks never form pair bonds, and almost all copulations are forced. Lesser scaups do form pair bonds, and attempt forced copulations with other females somewhat less often.
"They're quite cooperative," biologist Patricia Brennan says of her research subjects. "The males get used to being handled."
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As the researchers expected, the lesser scaups housed in groups grew longer penises than those housed in pairs. The results were published Wednesday in the journal The Auk.
Meanwhile, ruddy ducks already have enormous penises that stretch nearly as long as the rest of their bodies. Brennan didn't see how the ruddy ducks could possibly grow them even longer. In one way, she was right: most group-living ruddy ducks did not develop longer penises. Instead, she was surprised to find, they hardly grew penises at all.
These ducks formed dominance hierarchies. One male at the top grew a really long penis and kept it throughout the breeding season. Subordinate ducks, unable to grow longer penises, demonstrated a different strategy. "Everybody else grows a penis very quickly, trying to sneak in some copulations before the [dominant] male starts beating them up," says Brennan. After breeding, their penises then shrink back to a non-reproductive state just as rapidly. If they're lucky, they can get away without incurring the wrath of the boss duck.
The impacts of communal life on each species reveal a unique aspect of duck biology: the social milieu has a stark effect on penis growth. The only other animal known to modify its genitals according to the social environment is the hermaphroditic acorn barnacle, a crustacean that grows a longer penis when its colony is sparsely populated so it can better reach its nearest neighbor.
These patterns are only possible because these animals have the unique ability to regrow their genitals each year, says University of Southern California biologist Matt Dean, who wasn't involved in the study. Other vertebrates do annually grow and shrink their testes, but it's very rare for animals to enlarge and reduce the penis itself.
"It's when the conditions vary year to year that plasticity itself becomes advantageous," he says. "If you don't need it, maybe don't grow it." Or at least, don't grow it quite as long.
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Duck Penises Grow Bigger Among Rivals - Animals
The Lake Duck Has The Largest Penis Relative To Body Size ...
Duck Penis
