Jellyfish live in the ocean. Jellyfish drift with the currents, often gathering in sheltered bays.
Most catch their food with their tentacles as it drifts by and is then carried to the mouth, which is located in the center of the bell shaped body. Some jellyfish eat small shrimp and fish, some like tiny plankton and some are like coral that have algae in their bodies which produces food for them.
They swim in a strange way, a pumping action. Muscles in their bodies contract and propel them through the water. This only allows them to move up or down in the water. The four-sided box jellyfish are powerful swimmers with good control and speed.
Jellyfish have a jelly-like appearance. This is where they get their name. They also have a bell-like shape and tentacles. Jellyfish come in many sizes. Some are small and some are very large. Some have bodies that are so clear you can see through them. Some jellyfish have a thick fluffy-looking frill between the upper bell and the lower tentacles, which actually contains many mouths to trap small animals from the waters around them.
Jellyfish predators include: tuna, swordfish, moonfish, triggerfish and certain kinds of sea turtles - especially the leatherback turtle.