Starfish are capable of having up to around 50 arms. When one of their limbs is removed, they can slowly regenerate it. Sometimes they will remove their own limb to escape predation. When a starfish captures prey, it will grab onto it with suction cups and move their stomach outside of their mouth for digestion. Once finished eating, the stomach will return inside of the body. Starfish are capable of having up to around 50 arms. When one of their limbs is removed, they can slowly regenerate it. Sometimes they will remove their own limb to escape predation. When a starfish captures prey, it will grab onto it with suction cups and move their stomach outside of their mouth for digestion. Once finished eating, the stomach will return inside of the body.