There is surely a lot of crazy things happening around the world every day, but piranhas? Come one, this must be some kind of a weird dream! When in a flock, these nasty predators is able to gnaw the carcass of a large animal (or of a human, for this matter) in mere minutes. One of them is not nearly as dangerous, yet will still cause significant bodily harm. They should be cautiously avoided, if possible. Or killed without mercy, if not.
Damage dealt by Piranha can not be reduced.