Aye-aye

This is an Aye-aye, which is a species of Lemur from Madagascar. (aren't they all?)

More info here

American Pit Bull Terrier

Perhaps the original buff dog, the American Pit Bull Terrier is not an animal you would mess with. Although bred for fighting these dogs tend to be simply more determined than vicious when reared as pets as the media would have you believe. Obviously they can be trained in such a way that they become vicious towards humans but so can any creature with a modicum of intelligence.

Source