Bat Statue

The Bat Statue is one of 42 statues introduced in the 1.1 update. It can be found randomly in underground caverns, and may be harvested with a hammer. It spawns a bat when powered. This statue is pretty much useless because spawned monsters do not drop coins. However, it is possible to receive hearts from them (rather ineffectively). Placing the bat statue in a box of stone (or whatever) with Dart Trap (or lava) will kill several every few seconds using timers. If you put this box in your boss fighting area, you'll use fewer potions.