Argentine Blue-bill, Argentine Lake Duck or Argentine Ruddy Duck
Why are duck penises corkscrew-shaped and how do they mate? | BBC Science Focus Magazine
White-headed Duck (Oxyura leucocephala) adult male, pulling extended penis with beak after mating, Stock Photo, Picture And Rights Managed Image. Pic. FHR-02085-00041-676 | agefotostock
Lake duck - Wikipedia
OMGFacts - Argentine lake ducks can have penises of up to 17 inches in length—the largest of any known bird. | Facebook
Duck Penises Get Bigger When They Are Surrounded By Other Males
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
Ballistic Penises and Corkscrew Vaginas: The Sexual Battles of Ducks | Discover Magazine
When growing their penises for the season, ducks bend to social pressure
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
Science News - Freaky Friday Lake ducks The male lake duck is in the 3% of birds that have penises. More curiously, it has the longest penis of all vertebrates in comparison
Duck with Prolapsed, Gangrenous Penis Gets a Trim - YouTube
Our Duck Penis Problem - The Wisdom Daily
Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl
Social environment matters for duck penis size - BirdGuides
Bird penises are fascinating. Wait, where are you going? | Grist
Argentine ruddy duck / Argentijnse stekelstaarteend
Duck named Dave has to have penis removed after being 'over-amorous' with ladies - Mirror Online
Duck Penises Grow Bigger Among Rivals
Lake duck - Wikipedia
Pacific Black Duck Penis | Displaying its penis. Lake Wendou… | Flickr
