Giant bat

Deep within the caverns of a desert planet reside giant bats (大コウモリ ōkōmori).

Fiction

Travelling through a cave leading to the Decepticons' battleship base, Rodimus Convoy Jr. turned on his optic lights when he entered a dark area, revealing giant bats flying about. Yūji, who was merged in Rodimus Jr.'s body, freaked out at the sight, but the Autobot said they were harmless. Rodimus Jr. Does His Part! Defeat the Legendary Evil Beasts