The pufferfish caught in a net in this fascinating YouTube clip gives a perfect demonstration of how they ‘puff’ their bodies up. One moment it looks like a regular fish, and the next it resembles a ...

Following is a transcript of the video. Narrator: If there's one thing you know about puffer fish, it's that they can do this. When aggravated by a predator, they, you know, puff up. Some puffers, ...

Pufferfish have a couple of ways to defend themselves: They have an incredibly potent toxin in their flesh, and they can puff themselves out into a spine-covered ball that’s pretty difficult to eat.