Giant Jellyfish

Unlike its smaller cousins, the giant jellyfish is an active predator that chases down its prey through reefs or open water. It can even squeeze its enormous bell-shaped body into the tight confines of shipwrecks to drape its mane of tentacles across the exposed flesh of its prey.

Many varieties of jellyfish drift through the world's oceans, feeding on fish and other tiny marine creatures. However, deadly species of monstrous jellyfish pose a threat to unwary swimmers and sailors alike. Note that while jellyfish are animals, they also have the mindless trait because they lack a centralized nervous system.