Why do puffer fish “puff up”? Pufferfish will “puff up” as a defense mechanism if they are threatened. A shape that is more than double its original size, round and sometimes covered in spines is much more difficult to bite and isn’t very appetizing to a predator. However, just as people should stretch before exercising to avoid injuring themselves, puffers need to stretch out their muscles as well.
The Pufferfish is a family of fish, with about 100 species. They are also known as the blowfish, fugu, swellfish, and globefish.
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