Dirty Eggs

me: Do the chickens push the egg out their vagina or their ass? Sometimes it seems like there is shit on the eggs when I gather them.

N: Chickens don't have vaginas or assholes. They have cloacae. It's an all-purpose hole. So yeah, there probably is some shit on the eggs, coming out of the all-purpose hole.

me: No chicken vaginas?

N: No chicken vaginas.

me: Hmm. . . How do the roosters fertilize the eggs?

N: A rooster has a cloaca too. So when a hen and a rooster mate, they rub their cloacae together for the fluid exchange. [Seriously - he used the words "fluid exchange." And my mind wandered into thoughts about rubbing holes together before realizing . . . .]

me: A rooster has an all-purpose hole too? So a cock doesn't have a cock? My mind has been blown.

+++++
Wikipedia says roosters don't have penises.
Some guy at Harv*rd says male chickens do have a small penis (buried in their all-purpose hole, I'm guessing.)
This Aussie site on chicken ("chook") breeding doesn't mention penises, just the all-purpose hole.
+++++

You know, I am not interested in the chicken-or-egg question. I AM interested in knowing how a penis came to be known as a cock if male chickens don't really have one, or if they do, it's buried in their all-purpose shit-semen-piss hole. Etymology of sex slang is fascinating. Or perhaps I just need to get some sleep.