Pufferfish Skeleton
You’re looking at the spines of pufferfish which are just modified scales. They can puff up to two or three times their normal size. Most puffer fish contain a neurotoxin called tetrodotoxin that can be 1200 times stronger than cyanide. In Japan, Puffer fish is a delicacy called fugu. Chefs must train three years or more before they can prepare it.
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