They can be found in uncovering expansion zones.
They can be spawned in 3x3 free spaces as long as the center square is a buildable square.
They can be cleared by tapping three times with a specific Element Shard.
Clearing Fruit Bats rewards you Bits either individual or at the end. They also have a small chance to reward a Gem.
There are 6 types of Fruit Bats, matching each of the Elements of Harmony. They can be distinguished by the colors of their hide.