Jellyfish live close to the ocean shorelines, spending most of their time floating near the water’s surface. They have bell-shaped, see-through (called gelatinous) bodies that are between 95 percent and 96 percent water; they have a muscular ring around the margin of a bell-shaped body that contracts rhythmically to propel them through the water. Jellyfish are carnivores, subduing their prey with stinging tentacles and drawing the paralyzed animal into the digestive cavity. For humans, such a sting from most types of jellyfish is extremely painful.