Hagfish: Slimy Deep-Sea Creature

The Hagfish, resembling a slimy eel, secretes abundant slime for defense. When attacked, it can rapidly produce enough slime to obstruct a predator's gills. The slime can expand 10,000 times in an instant and is softer than Jell-O. They can also eat by simply sitting inside a corpse and absorbing nutrients directly through their skin and gills. Their skin is actually more efficient at absorbing nutrients than their own intestines.