Piranha

The Piranha is an enemy that can be found in water pools in the Jungle and Underground Jungle biomes and in the Cavern layer. It is twice as common in the Jungle biomes.

Piranhas swim in a straight line left or right until hitting a wall, where they flip directions. They will swim towards the player if they are submerged in water; otherwise they pay no attention to the player. They move their tail back and forth and swim in a slight zig-zag. If a Piranha is outside of the water, it will flop around wildly, making it dangerous to approach.