Nibbler

Leela adopted Nibbler as a pet on Futurama. Nibbler eats everything, even animals and things much larger than himself. We learn that his, um, droppings weigh about 10,000 pounds and can be used as fuel for the Planet Express rocket. Nibbler is actually intelligent and can speak, but he has only revealed that a couple of times. After someone discovers Nibblers true self, Nibbler flashes his third eye to wipe his memory clean.