The piranha is a freshwater fish known for its sharp teeth and powerful jaws. They are primarily found in the rivers and lakes of South America, particularly in the Amazon River basin. Piranhas are often recognized for their aggressive behavior, especially when in schools, and they primarily feed on smaller fish, insects, and plant material. Piranhas belong to the family Serrasalmidae and can vary in size, with some species growing up to 12 inches long. They are often depicted in popular culture as ferocious predators, but their diet can be quite diverse. Piranhas play an important role in their ecosystem by helping to control fish populations.