Theyfire a harpoon-like filament called a nematocyst into their prey. Once injected with the paralyzing neurotoxin, the prey is guided into the mouth by the tentacles.
<em><u>Simple answer: They feed by paralyzing their prey and pulling it to their mouths.</u></em>
They practically poison their prey (as the other answerer said) so that the prey is paralyzed, then they pull the prey into their mouth with their tentacles !
