The spiny mouse is kind of the Wolverine of the animal kingdom. Not only can he discard chunks of his skin to release himself from a predator's clutches, but he's also capable of re-growing the skin, cartilage, fur and even his sweat glands once they're removed. Researchers believe mammals might have the same genes that allow for regeneration in reptiles, but the spiny mouse is the one known mammal whose genes aren't turned off.
5. Scarlet Jellyfish