Pufferfish have highly elastic stomachs and can quickly ingest huge amounts of water to turn themselves into a virtually inedible ball, several times their normal size.
Many scientists are of the opinion that these fish developed inflatability as a result of their slow, somewhat clumsy swimming style that makes them vulnerable to predators. They have tough, usually prickly skins and fused teeth that form a beaklike structure with a split in the centre of each jaw. Some species also have spines on their skin to make them even less palatable. Though they are considered small, some of them grow to a size of 90 centimeters.
Puffers are found in warm and temperate regions around the world, primarily in the sea but also, in some instances, in brackish or fresh water. Their diet includes snails, worms, and other crustaceans. Pufferfish are also known as blowfish.
Picture Credit : Google