bat

蝠 is composed of 虫 (insect) and 畐 (filled). 虫 refers to animals, while 畐 depicts a long-necked, round-bellied vessel for holding wine. Therefore, 蝠 is used to describe an animal that resembles a mouse and has the ability to fly. When resting, this animal folds its wings and hangs upside down from the ceiling of a cave, taking on a shape similar to a long-necked, round-bellied wine vessel.