Female Fish Genital Openings Are Smaller When There Are Lots Of Predators Around

Plants and Animals





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A female mosquitofish (G. hubbsi) from the Bahamas is shown. A new study shows that female mosquitofish genitalia evolve in response to predation and interbreeding risks. Christopher Anderson/NC State University.

Penises come in all sorts of shapes and sizes. Some are lobed and paired, some are highly maneuverable, and at least one allows an animal to inject sperm into its own head. Well there’s a diversity of female genitalia, too.