5. Puffer Fish
These guys are quite cute at first, but once you startle them, you just want to poke them. This Family of fish (I couldn’t choose just one) is able to swallow water (or even air) quickly, so much so that they become spherical, scaring off predators. This often saves both of their lives, since most puffer fish species are poisonous. You should be safe as long as you don’t eat it, with proper preparation, it can be served as a dish (see Top 10 Poisonous Foods We Love To Eat – item 9). Not to be mistaken for their cousins, the porcupine fish (they are two separate families).
Fun Fact: Puffer fish have the smallest genomes in the vertebrate world.

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