Why are duck penises corkscrew-shaped and how do they mate? | BBC Science Focus Magazine
The extraordinary sex life of the common mallard - St. Albert Gazette
Birds in Focus: Repro-duck-tion | Spring 2014 | Articles | B
File:Duck Reproduction.svg - Wikipedia
Duck penises grow bigger when males spend time together | Daily Mail Online
How do ducks have sex with their corkscrew-shaped penises? | Metro News
There is a Type of Duck That Sometimes Lassos its Potential Mates with its Penis
Duck penis controversy: NSF is right to fund basic research that conservatives misrepresent.
The horrible thing you never knew about ducks
Patricia Brennan wants you to consider the duck penis — Mount Holyoke News
Interesting Facts About How Ducks Mate - Farmhouse Guide
Do Ducks Have a Penis? - Cackle Hatchery
Column: Why I study duck genitalia
Prolapsed Phallus in Ducks | BackYard Chickens - Learn How to Raise Chickens
Duck penis plasticity – yes you read that right | The Waterthrush Blog
The sex wars of ducks | Nature
File:Mallard with visible pseudo-penis.jpg - Wikimedia Commons
Genitalia Gap: Biologists Prefer the Penis - But Why?
Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl
Found! The longest bird penis ever › News in Science (ABC Science)
White-headed Duck (Oxyura leucocephala) adult male, biting extended penis after mating, on water (captive) - SuperStock
Duck has penis removed after mating 10 times a day
Do Ducks Need a Mate?—Everything You Need to Know
This Is How Ducks Have Sex And It's Pretty Incredible
Twisted Love: Sex Lives of Ducks and Geese - Backyard Poultry
Ballistic Penises and Corkscrew Vaginas: The Sexual Battles of Ducks | Discover Magazine
Duck Penises, Mating Habits, and Drake Behavior. An Exchange with Patty Brennan, PhD, Professor of Biology at Mount Holyoke College — Sanctuary @ SHO
