33. Which fish blows itself up into a prickly ball?

THE PORCUPINE FISH IS NAMED FOR THE SHARP SPINES, LIKE A PORCUPINE’S that cover its body. Usually the spines lie flat against the fish’s body, but if danger threatens, it can raise them. If an enemy comes too close, the fish takes in water, so that its body swells to twice as it’s normal size. It becomes a prickly ball too large and uncomfortable for predators to swallow. When the danger passes, the porcupine slowly returns to its normal shape and size.