absolutly anything: I'd be torn between several choices. The Tracker species had cool powers...one race had telekinesis and one had a hyperspeed-thing. But one of the Roswell ones would be awesome too, like Max with his psionic sheild ability. I can't say Quetzalcoatlus in this case, there aren't sharp teeth or claws there. Buffy had some nice choices too. The Beast from the Angel end of things had a rock-hard skin and huge strength...the Judge couldn't be killed very easily, neither could Glory. I could also go for a Utahraptor if we're excluding fictional races.
anything in animorphs:andalite
sticking to the zoo: tiger
with a team:eagle