Friendly-looking fish capable of killing 30 grown men

Pufferfish are all the fish that are in the family Tetraodontidae. That’s about 120 species in 19 different genera. They can be found in tropical waters all over the world, in both saltwater habitats, such as the Pacific Ocean and the Red Sea, and freshwater habitats such as the Mekong River, the Amazon River and estuaries.

This puffer fish is the second most venomous vertebrate on the planet. Slow moving, it defends itself with rapid inflation and spines. If that isn't enough, its skin contains a powerful toxin.

Ingestion of this fish would lead to a predator's certain death. One puffer fish contains enough toxin to kill up to 30 grown men. It is a welcome sight for divers looking for a photograph, but they are wise to keep a respectful distance.