Foreskin - Foreskin in Non-human Species

Foreskin in Non-human Species

Further information: Sexual reproduction in male mammals

In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. Almost all mammal penises have foreskins, although in non-human cases the foreskin is usually a sheath into which the whole penis is retracted. Only monotremes (the platypus and the echidna) lack foreskins.

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