Rockstar
They say beauty is in the eye of the beholder, but in this instance no one could ever say any of these creatures are attractive. They might be adorable (sort of), but they are ugly as sin nevertheless.

Mole rats and bats are the animals that always look like they have had a run-in with the Ugly Wizard; for canines, it seems as if the Chinese Crested breed is up there in the world's most ugly as well.