Jellyfish is a relatively simple creature, and its nervous system is not as complicated as that of mammals, and there is no obvious central nervous system. Jellyfish mainly prey on special cells on tentacles-stinging cells, which release venom to paralyze or kill prey. When the prey touches the tentacle, the nerve cells of jellyfish will transmit signals, prompting the stinging cells to release venom, thus completing the predation process.

Although the nervous system of jellyfish is relatively simple, they also respond to environmental changes and show certain learning behavior. For example, some studies show that jellyfish can learn through trial and error, gradually adapt and learn how to avoid adverse stimuli. In addition, jellyfish can change their swimming direction by waving tentacles to adapt to changes in the environment.

Although jellyfish are not as complicated as mammalian brains, they complete their predation behavior by transmitting signals from nerve cells, and show certain learning behaviors to adapt to environmental changes.