3. Leopard Seal
These guys look so cute that you certainly wouldn’t expect any harm from them, after all, they can even smile. Their mouth is curved upward which creates the illusion of a grinner smile. Leopard seals have a very diverse diet: They eat krill, different kind of fish, marine mammals and king and even emperor penguins.
So basically there is almost nothing they can eat. Keep this in mind when you want to swim with this cutie. A short time ago, a biologist was dragged 200 feet below the surface by a leopard seal. The person died and the intention of the animal is not clear.