Puffer fish are surprisingly diverse in size. They can be as tiny as the 1-inch-long pygmy puffer or as huge as the freshwater giant puffer, which can reach more than 2 feet in length. Imagine ...

puffer fish are not like balloons. Because what's normally inside them isn't air. It's water. Elizabeth Brainerd: What they do is they actually take water into their mouths in a big mouthful of ...