Just a few of the non zoo animals you may discover...

Derimites
Djiggas
Aerimon
Imps
Yarzon
Molboro
Goblins
Skeletons
Kobolds
Goobue
Puks
Elementals
Raptors
Peist

and this is just to name a few, the starter areas may be more zoolike but as you get further you see it go away from that