Jellyfish use their tentacles to eat their food.

Under the umbrella, those slender tentacles are its digestive organs and also its weapons. The tentacles are covered with stinging cells, which are like poisonous threads and can shoot venom. After the prey is stung by the stings, it will be quickly paralyzed and die. The tentacles grab these prey tightly, retract them, and use the polyps under the umbrella to suck them. Each polyp can secrete enzymes to quickly break down the protein in the prey. Because jellyfish have no respiratory organs and circulatory systems, only primitive digestive organs, the captured food is immediately digested and absorbed in the coelenter.