The+piranha.

Piranhas are carnivorous freshwater fish taht live in the rivers of South America. They are the most voracious and dangerous fish of those known. They are not veru big, tehy measure about 30 cm, but they form so big shoals that they can hunt and kill animals bigger than them. They feed mainly on fish and they systematically attacks all animals that arrive at their domains. They are popularly known for their sharp teeth and insatiable and aggressive appetite for meat.