Piranha

Piranhas have 30 health and can be found in water in the Jungle, Underground, Cavern layer, and potentially the Underworld if it is flooded with water. They have an increased spawn rate in the Jungle. They swim in a straight line left or right until hitting a wall, where they flip directions; upon breaking the surface of a body of water, they will flip upside down briefly, then right themselves when they re-submerge. They will swim towards the player if he/she is submerged in water; otherwise they pay no attention to the player.

Drops

 * 2.5% (&#8776;1:40 chance)
 * 0.2% (1:500 chance)
 * Around 300.