In fact ... there are many kinds ... such as piranha, commonly known as piranha and piranha, which is a carnivorous freshwater fish in South America. They are usually 15-25 cm long, and the longest can reach 40 cm. Piranhas have sharp teeth (they can easily bite off steel hooks or human fingers) and are very fierce. Once they find their prey, they usually attack it in groups. Piranha can eat a rib head of a live cow in 10 minutes. The local people use their teeth as tools and weapons. Rivers such as Amazon River, Guyana River and Paraguay River are frequented by piranhas/view/6503.htm.