The Porcupinefish reference article from the English Wikipedia on 24-Apr-2004
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Porcupinefish

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Porcupinefish are fish of the family Diodontidae (order Tetraodontiformes).

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Porcupinefish

They have the ability to blow themselves up by swallowing water or air when threatened. They are covered by long spines that stick out sharply when the fish is inflated.

The porcupinefish is closely related to the pufferfish, which does not have spines.