In Defense of Studying the Duck Penis - Pacific Standard
Duck Penises Grow Bigger Among Rivals
Special Announcement: April is D.P. Month! | Curious Cox
Rubber Duck with a Dick - The Inappropriate Gift Co
Pet duck needs penis removed after trying to mate 'between 5 and 10 times' per day: 'It was pretty horrific' | Fox News
Ducks fight the battle of the sexes in their genitals | New Scientist
Do Ducks Have a Penis? - Cackle Hatchery
In duck socialization, size does matter — Mount Holyoke News
Prolapsed Phallus in Ducks | BackYard Chickens - Learn How to Raise Chickens
In Ducks, War of the Sexes Plays Out in the Evolution of Genitalia - The New York Times
Duck penises grow bigger when males spend time together | Daily Mail Online
philosomama: Duck willies
File:Duck Reproduction.svg - Wikipedia
Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl
Duck penis plasticity – yes you read that right | The Waterthrush Blog
Duck Penis Length Depends on Other Guys | WIRED
Twisted Duck Sex
Why are duck penises corkscrew-shaped and how do they mate? | BBC Science Focus Magazine
Sexual Competition among Ducks Wreaks Havoc on Penis Size - Scientific American
Sex-Crazed Dave The Duck Has Penis Removed After Trying To Mate 10 Times A Day - UNILAD
Why are duck penises corkscrew-shaped and how do they mate? | BBC Science Focus Magazine
Duck Penis Paradox: PLOS One's Mission to Democratize Science | The New Republic
