Starfish are echinoderms and relatives of the sea urchin. There are as many as 2,000 starfish species around the world. Not all of them are star-shaped either. There's even a species with 30 arms. When they get attacked by a predator, they'll rip off their own arm to get away while the predator eats it. Their arms can regenerate, so I guess they regrow later. Starfish can eat almost anything in the ocean. They feed by pushing their stomach out of their mouth and directly digesting their prey. Fun fact, there's an area in Kumamoto Prefecture where they eat starfish. As you'd expect from a relative of the sea urchin, you strip the skin to eat the insides, like with sea urchins. Even in other languages, starfish mostly have star-related names. For instance, in France they're called lèche mes couilles.

Magicka Wizard Wars... .-.
judging you right now xD