It's a cloaca: http://en.wikipedia.org/wiki/Cloaca http://en.wikipedia.org/wiki/Cloaca Basically, it's a vent that everything comes out of. (and in, in the roo

It's a cloaca: http://en.wikipedia.org/wiki/Cloaca http://en.wikipedia.org/wiki/Cloaca Basically, it's a vent that everything comes out of. (and in, in the rooster -> hen case)