Emballonuridae

Emballonuridae is a family of microbats known as sac-winged or sheath-tailed bats, found in tropical and subtropical regions worldwide. The earliest fossils date back to the Eocene. These bats are among the smallest, ranging from 3.5 to 10 cm in body length, typically appearing brown or grey, with some species in the genus Diclidurus being white.

They have handsome faces, long narrow wings, and employ ultrasonic echolocation, with some signals audible to humans. Anatomically, they exhibit primitive features, such as postorbital processes and simple joints, but are more advanced in the structure of their digits.

A distinctive characteristic is the uropatagium, a membrane extending between their legs, with partially enclosed tails that form a sheath. Many species possess sac-shaped glands in their wings that may release pheromones, while others have throat glands that produce strong scents. They prefer well-lit roosting spots in hollow trees or cave entrances and can be solitary or live in large colonies. Outside tropical regions, some enter torpor or hibernation during colder months. Emballonurids primarily feed on insects, occasionally consuming fruit.