I saw the option to put my minion in a minion zoo. Where exactly is it? I can't find it.

Here you go: ">http://subeta.net/games/minions/

it is in beta, and is currently only open to GAs. If you wish to find it again go to the GA forum and there's a Beta subforum.

Minions that go to the Zoo are not findable in Account Search, so if you want to know what's in there you have to go and look. If you are not a GA anymore you will lose access-maybe you can get your minions back if you file a Ticket in Help. We've been told that no minions will be lost, so they will still be there when this feature does go live.