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The Longest Relative Penis in Nature
Barnacles have penises up to 8 times their body length — the longest ratio of any animal on Earth.
Animals get Freaky.
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Discover fascinating, scientifically-accurate facts about animal reproductive biology. From detachable penises to aerial mating dances — the animal kingdom is stranger than fiction.
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The Corkscrew Arms Race
Male ducks have corkscrew-shaped penises that spiral counter-clockwise, while females have vaginas that spiral clockwise — an evolutionary arms race.
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Females With Fake Penises
Female spotted hyenas have a pseudo-penis — an enlarged clitoris so similar to a male's penis that even biologists struggle to tell them apart.
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Dive into 79 researched and cited facts about animal reproduction.