🔄FROM THE ARCHIVE How do dolphins do the dirty deed?
), and harbor seals — those were the only species they had high-quality male and female reproductive organs for . They were also able to create digital 3D models of the penises and vaginas and simulate various rotations and positions to determine the deepest penetration possible.
But the really fascinating part was that the scans revealed how vaginal complexity could limit penile penetration. “This confirmed there is this antagonistic coevolution,” said Orbach. That suggests that the folds allow the animals to control paternity, although further analyses will be needed to confirm that hypothesis.
The trio hopes to look at more species, including various ungulates — distant cousins of whales and dolphins. “I had the opportunity to dissect a hippo penis awhile back, and it was amazing how much it looked like a pygmy sperm whale,” Orbach recounted. “I’m really curious about how the different environments have affected penis morphology, and how much relates to a shared history, because in most animals we know that genitalia are one of the most rapidly evolving characteristics.
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