Starfish is a kind of echinoderms, divided into two families: petrel and starship, which are mainly distributed in shallow seabed sand or rocks all over the world.
Starfish is a greedy carnivore. Although they are not as agile and swift as sharks, their main prey are some slow-moving marine animals, such as shellfish, sea urchins, crabs and anemones. It often adopts a slow and tortuous strategy, slowly approaching the prey, grasping the prey with the tube foot on the wrist and wrapping it all over, spitting out the stomach bag from the mouth, dissolving the prey in vitro with digestive enzymes and being absorbed by it.