Penis Size Depends on Other Guys… For Ducks
A new study at Yale University has found that the length of a duck’s penis depends on the other ducks with whom he flocks. The study showed that a duck’s dick experiences significant shrinkage at the end of a given breeding season, and then RE-grows when the next season begins. Junk regeneration varies depending on overall penal competition in the flock. (Cockpetition? CompeDICKtion?)
Presented at the Animal Behavior Society annual meeting, the study therefore suggests that social circumstances influence penis growth in vertebrates and that extra length may give a male an advantage in delivering sperm in females with multiple mates. Unfortunately, no information has been obtained on whether any other species responds to sexual competition in the same way.
