Comb jellies swim with 8 rows of ciliary combs that beat in waves. The beating combs create a multicolor effect. They eat fish larvae and other plankton. They capture prey with two tentacles called colloblasts.
Jellyfish are strange, with of their body water they don't have a brain, all jelly fish have a squishy hemisphere for a head and deadly stingers that are directly below the head. The stingers kill fish, some jelly fish can kill or wound a human.