A nice little piece of info here. The argentine lake duck.
Most birds don't actually have penises. To reproduce, they usually simply rub cloacas (The one genital opening for a bird). This is known as a "cloacal kiss"
Most female birds also only have one ovary and one oviduct. Well. They have two, but only one develops into a functional organ (Apart from raptors/bird of prey, they often develop the second.).
Birds can also bias the sex of their offspring relative to the amount of food available, among other factors.
This site offers some interesting facts on the subject of avian reproduction:
http://people.eku.edu/ritchisong/avianreproduction.html
Waterfowl and ostriches are some of the few birds that actually possess a phallus.
In fact, The longest avian phallus belonds to one duck species, the argentine lack duck. Images of said penis under this cut
That's 42.5cm long.
And ducks have corkscrew shaped penises. Which creeps me out.
Info from here: http://www.abc.net.au/science/news/enviro/EnviroRepublish_366856.htm
Most female birds also only have one ovary and one oviduct. Well. They have two, but only one develops into a functional organ (Apart from raptors/bird of prey, they often develop the second.).
Birds can also bias the sex of their offspring relative to the amount of food available, among other factors.
This site offers some interesting facts on the subject of avian reproduction:
http://people.eku.edu/ritchisong/avianreproduction.html
Waterfowl and ostriches are some of the few birds that actually possess a phallus.
In fact, The longest avian phallus belonds to one duck species, the argentine lack duck. Images of said penis under this cut
That's 42.5cm long.
And ducks have corkscrew shaped penises. Which creeps me out.
Info from here: http://www.abc.net.au/science/news/enviro/EnviroRepublish_366856.htm