They are scaleless fish and usually have rough to spiky skin. All have four teeth that are fused together into a beak-like form.

What kind of fish is puffer fish?

puffer, also called swellfish, or blowfish, any of about 90 species of fishes of the family Tetraodontidae, noted for their ability when disturbed to inflate themselves so greatly with air or water that they become globular in form.

Is a puffer fish a mammal?

This odd-looking creature is a fish called a puffer fish. Like all fish, puffer fish are vertebrates. ... In fact, it's the second-most-poisonous vertebrate in the world after the poison dart frog.