Piranhas are small and fast fish. They usually stick together in packs and will storm their prey as a group. They are only found underwater in the Jungle where they infest the green murky waters. They will hunt you down till either you die, or you kill them.
Piranhas will chase you trying to attack, If they get close enough they will start biting you. Piranhas are especially dangerous when in groups.
On death Pirnahas do not drop anything.