What do bats eat in minecraft?

Many bats can spawn in a small area when there is no where else to spawn. Examples of this can be in creative mode if a small player-made overhang is created. Bats are the only passive mob that can spawn in caves. Bats can be found hanging on the ceilings of caverns when they are not flying. read more

Bats can spawn in the Overworld at a light level of 3 or less on opaque blocks below layer 63. Between October 20 and November 3, they only require a light level of 6 or less to spawn. On Superflat worlds, bats spawn below the top non-air layer, ignoring the usual layer-63 limitation. Drops . Bats do not drop any items or experience when killed. read more

Chickens do not need to eat, but give two chickens wheat and they will have a chick. Same with cows, sheep, pigs, and mooshroms. read more