Because his name is Sheppard, which sounds like Shepherd and wolves are traditionally predators of sheep (the animals which shepherds... herd)?
My favourite animal is probably the Homo Sapien, they're so nifty and inventive and it's fun watching them scuttle about and live their lives, maybe I'm a little biased though.
Platypus. It's a poisonous mammal that lays eggs. Need I say more?
You could also say that it can sense things underwater by using electroreceptors on its bill. That's pretty cool, too. Basically, platypodes are the weirdest things ever.
Octopi, they are so intelligent. They can change their shape and color to mimick other fish. Scientists say they will eventually (in the near future, I can't remember the exact date) match human intelligence.
The scorpion. For some reason we have no scorpion armatars, so I can't use one as my armatar. The scorpion is an arachnid with a poisonous tail and claws. Win. @bunniecorps Are you sure? Where did you get this information?