This season only welcome The new. The Scary. The awesome- CRITTER BATS! Located inside a critter container critter bats can be released with an artillery shot or with the help of their own kind- Critters!
Critter bats attack nearby defenses and support buildings.
Just because they got wings, it does not mean that they are immune to ground defenses. Critters will be taken down by a flamethrower as well as by a sniper tower and every other defense.
-from Dangerous Things Mobile Gaming