Octopus, also known as Octopus, Octopus, Octopus, Stone House, Stone Suction, Tide Watching and Dead Cattle, belongs to the order Octopus, which is a general term for cephalopods of the order Octopus, but only refers to octopus in a strict sense. Octopus is short oval, cystic, webless, and the boundary between head and body is not obvious. It is called "Octopus" because it has eight wrists on its head, a membrane between them, and two rows of sessile suckers on its wrists. Sometimes black ink is sprayed to help escape, which is distributed in tropical and temperate waters all over the world.