When do puffer fish inflate

Brainerd: There are a couple characters that are really helpful in their ability to puff up, and one of those is that they don't have any ribs, and another one is they don't have any pelvis. Narrator: In other words, puffers are essentially missing bones. And that's a good thing, because otherwise they'd get in the way of inflation. In fact, according to Brainerd, if it weren't for these missing bones, puffer fish would probably have never evolved this way in the first place.

And that would be a shame, since puffing up really is a good defense. Consider one old study in which researchers watched birds go fishing. The birds caught 11 puffer fish, but they dropped nearly half of them because the fish started to inflate. But what's more surprising is that the birds left with empty beaks might have been the lucky ones.

Because puffers have another, more potent defense up their sleeves. Their bodies are laced with a neurotoxin called tetrodotoxin. It's up to 1, times more poisonous than cyanide. So poisonous that one puffer fish can kill 30 adult humans. So poisonous that puffers are reportedly the second most poisonous vertebrate in the world, which is why it's also surprising that us humans?

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The water is expelled in a reverse of how it entered. Too much air trapped in his stomach can prevent a puffer from expelling the water, which can be fatal. Pufferfish learned how to inflate themselves in a two-step process, according to scientists. The first step, coughing, developed when these fish ate slimy creatures and needed to get rid of the shells and coating in their throats. In order to do so, pufferfish ancestors closed their gill slits and used muscles on each side of their heads to bring in water, and then quickly expel it to clean their throats.

In the second step the fish strengthened their coughing muscles in order to jet water out faster, and tightened their mouths so the water was more focused, like out of a waterhose nozzle. With this practice, the fish overturned sea urchins to get to their soft bellies. Instead of forcing water out, these same muscles bring water into the puffer instead, and then expel it once he feels safe again. Funny Fill-In.

Amazing Animals. Weird But True! Party Animals. Try This! Explore More. Common Name: Pufferfish.