Piranha

Piranhas have 30 health and can be found in water in the Jungle, Underground, and Cavern layer. 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% (1:40 chance)
 * 0.2% (1:500 chance)
 * Around 300.