In Ducks, War of the Sexes Plays Out in the Evolution of Genitalia – New York Times
in ducks, the males seem to do an equivalent of menstruating: they grow and lose phalluses.
an appendix to pearlofcivilization.net
In Ducks, War of the Sexes Plays Out in the Evolution of Genitalia – New York Times
in ducks, the males seem to do an equivalent of menstruating: they grow and lose phalluses.