Porcupinefish and pufferfish are a group of fish that puff themselves up rapidly when threatened. These fish can more than double their size by inflating their stomachs with water or air, making themselves much less attractive as a meal to predators.

Most porcupinefish and pufferfish also contain a deadly toxin, far more poisonous than cyanide, so if they are taken unaware the predators often won’t last for long. The meat from these fish are considered a delicacy in Japan, where it is carefully prepared by trained chefs, although it seems several customers still die each year.

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