14 Days of Genitals, Day 5: Corkscrew Cock

What, not impressed by an animal that will bite off its own penis in an attempt to break up with you, or a penis that can high five? Well, how about an animal naturally equipped to do the helicopter / open a bottle of wine?

#4 : Corkscrew Cock

This is definitely very like something from a "As Seen on TV" commercial.

Why have a dick shaped like a knock-off of the elder wand? Sperm competition! 

Pretty different from this, actually

See, lady ducks have a corkscrew-shaped vagina, so gentlemen ducks have to have a similar shape to, erm, scrape out the sperm of previous mates, as it were. Corkscrew cocks aren't just found in Ruddy ducks, but in many different paternally-invested waterfowl. Apparently if you're going to invest all the time in raising that chick, you want to make sure it's yours to begin with.

Coker, C. , McKinney, F. , Hays, H. , Briggs, S. , & Cheng, K. (2002). Intromittent organ morphology and testis size in relation to mating system in waterfowl. Auk (American Ornithologists Union), 119(2), 403-413.