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 ...

The smile of a starry puffer, Arothron stellatus ... Tetrodotoxin - often shortened to TTX -was named for the fish but scientists have since found it in other species including the blue-ringed octopus ...

There are over 120 species of puffer fish, and 22 different kinds are approved by the Japanese government for use in restaurants. But one is more prized, and more poisonous, than the others ...