One of most dangerous fishes in the world, lives in South American rivers.
Using very strong jaws and sharp teeth they used to hunt wide range of preys, even humans, Their strong jaws can easily crush a human within 10 seconds. Their special sensory organs also help them to detect presence of blood at water. Piranhas generally hunt at nights, for small fishes and aquatic animals.
Piranhas also group together for large preys horses, deers…Etc. They also attack humans, several cases reported in Brazil.