The complexity of male and female ducks’ reproductive organs indicates just this. Duck sex is far more interesting than it has any right to be, due to the twisted nature of the birds' genitals.
This is bizarre, considering that 97 percent of birds do not have phalluses or vaginal tracts.
The sex organs of female ducks are also highly specialized and unique. 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. The tinamous have similar anatomies to ducks but in significantly more modest proportions. Brennan recounts, “I saw this large complicated penis and asked myself, ‘Why do these males have such large phalluses?’” Trying to explain the duck’s unusual reproductive anatomy, Brennan changed gears and began focusing on ducks instead of tinamous.Duck phalluses are strange for several reasons.
This is an educational video about the ducks' mating rituals and more specifically the shape of the duck penis.
It takes the phallus just as much time to extend as it takes for the sperm to travel from the base to the tip of the phallus.By the time Brennan had entered the field, much work had already been published on male duck phalluses and their anatomy. 50 Ducks In A Hot Tub 141,909 views.
Therefore, only the fittest ducks with the largest phalluses could penetrate the complicated tract.
This means that only the fittest males can successfully copulate with female ducks.To test her hypothesis, Brennan conducted an experiment on a duck farm in California. This extensive study of the male duck provoked Brennan to ask, “What about the female?” She began studying the female duck’s anatomy with an amusing saying in mind: “For every car there is a garage.” This approach, apparently, had never been taken before, allowing Brennan’s recently published findings to represent a plethora of new information about the female duck’s reproductive biology.In most birds, the oviduct resembles a simple tube, but in ducks, the vaginal tract not only spirals inside the duck but also has sacs and crevices that add to its complexity.
Brennan wondered whether competition among males could also influence their penis development. The ducks on the California farm were genetically enhanced to be more fit and have larger phalluses, which made them perfect candidates for Brennan’s research.
This study showed that the shape of the female duck’s vaginal tract explains the correlation.
Their reproductive organs have co-evolved in a “sexual arms-race” resulting in large corkscrew phalluses and complicated vaginal tracts.Surprisingly, the female duck’s reproductive organs have not been studied in detail until recently.
Forced copulation, which is unlike the reproduction methods of any other birds, is not uncommon among waterfowl.The incidence of forced copulation among mallards, the most common species of ducks, has been confirmed in the literature since at least 1911. Male muscovy ducks, for example, have corkscrew-shaped penises that Some ducks also have barbs on their penises to scrub away competing sperm.They twist in the opposite direction to the male duck's penis. There are several theories that attempt to explain the unique evolution of ducks’ sexual organs; however, the most popular theory explaining the reproduction organs of waterfowl states that forced copulation is the cause of the unusual structures of ducks’ sexual organs.
Unlike mammalian phalluses, duck phalluses are not supported by blood or muscle but rather by lymph.
The more forced copulation a duck engages in, the In fact, male ducks grow a new penis every year (yes, you read that right). Some male ducks have phalluses that are larger than their bodies. After initial arousal, the duck phallus extends as sperm travel in the outer layer of the penis in a corkscrew path. Three synthetic duck vaginas with different structures were created: two tube-like ones, like the vaginal tracts of most birds, and one that was a replica of a common female duck’s vaginal tract.
Through natural selection, male and female ducks have co-evolved in the growth of their reproductive organs.While many aspects of duck anatomy still remain a mystery, the last few years have brought a wealth of new information to the field—with a great impact due to Brennan’s exploration of hitherto unexplored parts of the female duck’s anatomy.© 2020 Copyright Yale Scientific Magazine. According to the National Geographic article "Ballistic penises and corkscrew vaginas -- the sexual battles of ducks," female ducks have a long and twisted vagina that features a number of spirals and dead-end pockets. What does a Duck Penis Look Like *Ducks Mating In The Bath Tub* - Duration: 1:16.
Before shifting her research to duck anatomy, Brennan studied the tinamou, a family of 47 species of exotic birds found in Central and South America. But the question remained: why would forced copulation influence the structure of a female mallard’s vaginal tract?Brennan has collaborated with Richard O. Prum, Yale Professor of Ecology and Evolutionary Biology, to study the correlation between forced copulation and the complexity of duck genitalia. That is, female ducks have reproductive organs specifically designed to be hard to penetrate. Brennan and her colleagues wanted to see if the female duck vaginal tract was indeed harder for a male duck to penetrate. Duck penises evolved their corkscrew shapes as a result of conflict with females. Brennan, a post-doctorate researcher at Yale University, is one of the leading figures in the field of research revolving around the duck’s complex genital anatomy.As with many groundbreaking scientific findings, Brennan did not start out studying duck anatomy.
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