Dirty Ducks doing the Dirty Deed
In this here picture you can see the male duck is raping the female duck as he pins her head down with his male beak. The male duck brings along another male duck to protect him just incase he gets hurt, so there is someone else there to rape her for what she did to the first duck.
In this picture, if you look closley, the male ducks have traded places just because they can. Other male ducks around see the dirty slut duck and gather around for their turn.