3. Pacu Fish
Try not to get in the water when this fish is around, well, unless you like having scary nightmares. This fish that is commonly found in South America is closely related to the piranha. Although they mainly eat seeds and nuts unlike their carnivorous counterpart.
Pacu fish have a set of teeth that resembles a human’s which makes them a strange sight to see, but they do bite and bite hard if you’re not careful enough, so watch your hands.