Periodically, it has dilated end sacs known as terminal cisternae.
2.
Females of some waterfowl species have developed vaginal structures called dead end sacs and clockwise coils to protect themselves from sexual coercion.
3.
As a response, females have developed vaginal structures called dead end sacs and clockwise coils to protect themselves from forceful intermission.
4.
The male waterfowl evolution of a phallus to forcefully copulate with females has led to counteradaptations in females in the form of vaginal structures called dead end sacs and clockwise coils.
5.
The male waterfowl ( Aves : Anatidae ) evolution of a phallus to forcefully copulate with females has led to counteradaptations in females in the form of vaginal structures called dead end sacs and clockwise coils.
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