Bat

The bat was a flying mammal that was found on Earth and other planets.

When the USS Enterprise (NCC-1701) was traveling to the planet Thallus, a creature claiming to be Dracula appears on the bridge and turns into a bat, then a mist. He escapes into the turbolift. 

The Humans on Torgu-Va had collected droppings from a type of bat found on the planet to create nitrates. They also used the calls from the bat as identifying sounds in the tunnels outside of Federation Battle Station Torgu-Va. 

Types of bat

 * Kavarian tiger bat
 * Pyrithian bat
 * Sand bat