The little dormouse is pretty unassuming at first glance. However, it possesses a trait that is unusual to most mammals: autotomy. This means that, should a predator grab onto the dormouse's tail, the tail will become detached and the dormouse can scurry away. However, unlike lizards and other reptiles, the dormouse can only perform this magic trick once-- its tail is detachable, but does not regenerate.
5. Hairy frogs.
These amphibians are unusual-looking to begin with, as they are covered in bristly hair-like structures (hence their name, of course). However, these frogs also have a pretty extreme method of warding off enemies. They can break the bones in their feet and project them through the skin to act as makeshift "claws," which they can then retract as the tissue heals. So, they're essentially the Wolverines of the amphibian world!