How do puffer fish make themselves bigger?

How do puffer fish make themselves bigger?

Puffer fish use air or water to puff themselves up into a ball when they are angry or scared. They can do this because they have no ribs, and their skin is very elastic. Some of them also have spines, which stick straight out when the fish puffs itself up, and they poke the enemy with these spines.

Do you know that though puffer fish are extremely poisonous, they are considered a delicacy in Japan? Specially trained chefs removed the poisonous parts… but many Japanese still die of poisoning after eating this fish. So it would be safer not to eat any puffer fish!