This affernoon, we had an experiment about Ethology. The study target is Fifghting Fish. There are a lot of attack and defence behaviors distinguished into Lateral threat display, Tail beating, Gill opening, Chasing, Biting, and Flee. After the fierce battle the looser's tail fins were broken. Most of them were black and blue all over. We have to watch and write downthe frequency appears in all kinds of attack and defence behaviors. By the way, just as the name said if this kind of fishes are together, they will fight. Ihat is right in theory, but in the practice it may not work. We found the wrong example as a result of this experiment. According to it, we understand some of fighting fishes do not have this characteristic but are peaceable. After this experiment some of us adopted some of fishes.