Jellyfish are usually poisonous fish that come in all different shapes, colours and sizes. They are usually transparent which means you can see through them and they can hurt you if they sting you.

They are called jelly fish because their bodies are wobbly like jelly! Some jellies live in the bottom of the sea and can lighten up in bright colours. Some are as big as 40 metres long, almost 120 feet, as long as a train, with lots of stinging cells in their tails.