[Edit] Fair enough, parent didn't say "anus" "intestine" "digestive tract" or anything more specific. And the "last mile" is a shared pathway. "Butt" works :-)
Yes, it's called a cloaca: http://en.wikipedia.org/wiki/Cloaca
Basically, it's a vent that everything comes out of. (and in, in the rooster -> hen case)
[Edit] Fair enough, parent didn't say "anus" "intestine" "digestive tract" or anything more specific. And the "last mile" is a shared pathway. "Butt" works :-)