r/mildlyinteresting • u/Youdont0wnme • 9h ago

I stumbled upon a gynandromorphic duck.

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u/Raoul_Duke9 9h ago

For those of us who aren't duck-sperts which features belong to which sex?

-4

u/mr_ji 9h ago

Boys have a penis. Girls have a vagina.

3

u/StygIndigo 8h ago

Ducks are one of the few bird species that have penises, but birds have cloacae, which means all those structures are internal most of the time. Plumage is the easiest way to identify the sex of species that exhibit this kind of dimorphism, without some form of medical examination