The Norse have a Wolf. On the last Japanese land is a tiger and on the last Aztec land it's that ape/gorilla which you see doing the volcano epic when you get driven out of the Greek homeland.
IT"S AN APE! HOW MANY TIMES TO I HAVE TO SAY THAT THE CREATURE IS AN APE! Don't believe me? Go here! http://lionhead.com/botg/screenshots.html
Then, scroll down and look at the undead ape. It says 'The Ape is upset!
Lol storm.
Alright here's the thing...of course i can be wrong...
The creature is supposed to be a gorilla, however Lionhead Studios only made the Ape Model, so they used the Ape with a gorilla skin. (I'm pretty sure this is it, but I can be wrong)