Depending on what corners of the internet you frequent, you may have heard about the horrific corkscrew penises ducks use to solicit often nonconsensual sex. If you've never stopped to wonder about ...

Spend enough time amongst a group of guys, and invariably it can descend into a massive dick swinging contest. But it seems that some male ducks living in groups take this competition to the extreme, ...

Most birds lack genitalia, but male ducks are known for their long, spiraling penises, which have evolved through an ongoing cat-and-mouse game with females. A new study from The Auk: Ornithological ...

Male ducks respond to sexual competition by growing either an extra-long penis or a nub of flesh, a new study finds. The unusual phenomena occurred in two species studied: the lesser scaup (Aythya ...