My cousins got married at the Baltimore Zoo last fall and had a lovely wedding. They did not animal theme it nearly as much as I encouraged them too (the elephant invites I found for a kid's bridal shower would have been totally awesome), possibly because they have taste.
But if you are planning a zoo wedding and you want to theme it out, or just want to add a touch of whimsy, check these out:
Sadly, they are kind of expensive, definitely more than I would normally advocate paying for for anything silly like table numbers when you can just use a stick. Maybe the store would discount them if you needed to buy 15 though??