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Porcupinefishes and Puffers
When faced with trouble, a puffer gulps in water until its stomach is full and the fish swells in size completely spherical. If that little fish also has sharp spines, it's a little procupine puffer. When the fish expands, the spines extend. When danger is over, the fish releases the water, the spines lie flat and the puffer resumes its normal shape and size.