"You don't get as much milk from a sheep as you do from a cow, and it's less versatile. It's just generally not worth the trouble." Zadkiel shrugged. "I'd never been inside the cities until two months ago."
Possibly he shouldn't have given that much away, but it wasn't as if most people couldn't figure it out fairly easily. Even if he had managed to avoid saying anything terrible to Ganesh so far.