There are about 8 common species in my country, namely moon jellyfish, white jellyfish, jellyfish, crown-mouthed jellyfish, etc. People often classify them according to the difference of their umbrella-shaped bodies: some umbrella-shaped bodies glow silver and are called silver jellyfish; some umbrella-shaped bodies look like monks' hats, which are called man-of-war jellyfish; some umbrella-shaped bodies look like... The white sails on the boat are called sail jellyfish; some are like umbrellas, called umbrella jellyfish; some umbrella-shaped bodies are shining with the light of colorful clouds, called rosy jellyfish... Most of their lifespans are only a few weeks, and some live to about a year. Some deep-sea jellyfish can live longer. The umbrella body of ordinary jellyfish is not very large, only 20 to 30 centimeters long, but the diameter of the giant umbrella of the larger jellyfish can reach 2 meters, and the drooping tentacles are 20 to 30 meters long. In 1865, a rosy jellyfish washed ashore on the coast of Massachusetts, USA. Its umbrella was 2.28 meters in diameter and its tentacles were 36 meters long. Pulling the tentacles of this jellyfish apart, it is 74 meters long from the tip of one tentacle to the tip of the other. Therefore, it can be said that the jellyfish is the longest animal in the world. There are about 250 species of jellyfish in the world, ranging from 10 cm to 100 cm in diameter, and they are commonly found in oceans everywhere.