Bat

Bats are passive mobs that spawn naturally in caverns or other large enclosed spaces. Bats are the only passive mob able to fly, and the only flying mob that spawns in the Overworld.

Appearance
Bats are visually the second smallest mob in the game (first being the baby chicken), And are hard to see in an unlit environment. They have a dark brown pelt as color and have small wings with a flying animation. They also have little feet.

Spawning
Bats can spawn in pre-explored caves from older saves. They can also be spawned with their spawn egg. Bats can spawn in a house if there is a large enough area for the game to think of it as a cave.

On superflat worlds, bats can spawn in even a 1x1 dark space, such as in mob traps. This means it is possible for a bat to spawn in a dark spot in a regular world given there is just enough room available; there might not be a size requirement such as something as large as a cave or house.

Behavior
Bats sleep during the day and become active at night. A bat will hang upside down when it is idle, but once the player approaches, the bat will fly away. Bats cannot hang on transparent or non-solid blocks. When placed in a minecart, bats can move the minecart around on their own.

Bugs

 * There are odd collision bugs with bats and blocks; specifically, they might be able to move up through diagonal roof of glass.

Gallery
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