The puffer fish looks funny, and you can even use the word cute. Under normal circumstances, when it is not angry, it is like an enlarged tadpole. It has a round head, a small mouth and a thin tail. It can swim, but it is not fast. Everyone learned the story "Little tadpoles looking for their mothers" when they were young. If the puffer fish had been there, the tadpole would have regarded it as his mother without hesitation.

Pufferfish are more interesting when they are angry or in danger. Its belly will swell many times in a short time. At this time, the whole puffer fish looks like a ball full of air, round and very cute, and its mouth will chirp, which sounds a bit like a pig. Some kinds of puffer fish are covered with dense small spines, and when they are filled with air, they become small spines, like hedgehogs.