The blowfish is the second most poisonous animal in the world, only the golden poison frog is more dangerous. It carries the nerve poison tetrodotoxin which can kill human beings. The blowfish is well-known for its ability to blow up by three times of its size. Thus, it does not fit any more into the mouth of sharks or other big fishes. Blowfishes can swim backwards and turn on the spot. They eat algae, shellfishes and aquatic invertebrates. They are resident in tropical waters. Interesting: Dolphins use the poison to get into a state of intoxication, then drift through the water. However, also in this case the correct dosage of poison is very important.