Why not make something totally crazy and original like a flying t-rex/jaguar/shark hybrid from a secret kingdom hidden in the depths of the ocean!
That's just one example. Really, the possibilities on this game are endless. You don't need to stick to just a few animals.
However I'ma gonna vote for hyena in this case, just because I like them. But still know that you don't have limits when it comes to character creation in this game, and you can make whatever you like.