But that's not the case for a newly discovered species of river fish identified in Vietnam's Mekong Delta. Most animals have their reproductive organs located close to their tail-ends. "Conversely, the long penis could be the reason the females try to escape." (The bird is only 16 inches tall.) Females are often observed trying to fly away from an eager mate, leading experts to believe that the long penis could be an evolutionary response that makes forced copulation easier. The duck's penis is shaped like a corkscrew and can extend to more than 17 inches. But a few, such as the Argentine lake duck, more than make up for it, says Miss Cellania at Mental Floss. The Argentine bluebird duck's long corkscrew It's definitely an "unpleasant looking genital barb," says Ian Chant at Geekosystem, but "when they're trying to break through the tissue that blocks their mates' genital pores, male mosquitofish are probably less than concerned with winning any beauty contests."Ĥ. North Carolina State University Researchers found a reproductive shaft equipped with four sharp hooks, which males use to grab onto resistant females during mating. Yet the newly discovered llanos mosquitofish ( Gambusia quadruncus) is in possession of some of the most "fearsome" genitalia on the planet, says Megan Gannon at LiveScience. Within 24 hours, the slugs regenerate the penises and are ready to do it all over again.Īt first glance, this unremarkable freshwater-dweller from Mexico looks harmless. Once the slugs complete copulation, they " crawl away with their elongated penises still dangling," and then the organs suddenly sever from their bodies and float away. Sea slugs are "simultaneous hermaphrodites," meaning they possess both male and female genitals and use both during intercourse. But what makes this soft-bodied marine mollusk particularly different is its ability to grow a new penis within 24 hours. The Chromodoris reticulata sea slug has the peculiar ability to discard its penis after copulation.
The sea slug's disposable, regenerating penis
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