Jellyfish are cellular animals with no muscles and bones, and 98% of their body is made of water. Shaped like a parachute, transparent and soft. There are tentacles around the body, and the tentacles have stinging cells that can release toxins. Its toxin is very powerful, and if a person is seriously stung by it, it may be life-threatening. Jellyfish have a strange protein called equine. This protein emits strong blue light when it encounters calcium ions. When the luminous jellyfish floats in the sea, they appear in various shapes and forms, which is very beautiful and moving.

Jellyfish can predict ocean storms and are known as "wind ears". There are sensory organs growing around the jellyfish, which contain calcium substances that are connected to the nerves. Whenever a storm approaches, the changing air creates unusual friction with the ocean, producing infrasound waves. This kind of infrasound cannot be heard by humans, but jellyfish can sense infrasound that exceeds the speed of storms. At this time, the jellyfish will drift to the shore to escape the storm. Therefore, when people see jellyfish floating on the shore, they know that a storm is coming.