negative that would be ducks... the violent and vicious rape culture prevalent in so called ducks or "Anas platyrhynchos" as they are known is so widespread that female ducks have evolved cork-screw shaped vaginas to avoid getting pregnant from the wild rapings they will most likely endure multiple times in their
fowl lives.
not to be outdone, the male ducks, also known as "Drakes" have evolved outrageous penises to counter the anti-rape vaginal labrynths female ducks have created for themselves:
fact: ducks rape
fact: ducks gang rape
fact: ducks have been known to kill an enemy duck and rape its lifeless corpse for over an hour
http://www.science20.com/news_articles/duck_sex_even_more_screwed_human_sex