Starfish, despite their crusty exteriors, are vulnerable to predators like crabs, sea otters, sharks and other starfish. A starfish injured by any of these predators can regenerate damaged or missing limbs, although gulls swallow starfish whole.
Starfish, also known as sea stars, are marine animals with no brains. Their "blood" is filtered seawater. They can regenerate damaged or missing appendages. In some cases, they can regenerate their central bodies because their vital organs are in their arms, according to National Geographic. The common starfish lives up to 35 years, is 5 to 10 inches in length and weighs up to 11 pounds.