Bats have furry bodies that range in color to include shades of tan, red, brown, and grey. To compensate for their poor eyesight, bats typically have large ears designed for echolocation. As the only mammals capable of flight, they are very light and have wings. The bone structure of the wing resembles that of a human hand, as there are flaps of skin between the bones.
At their tiniest, bats grow between 2.5 to 3.5 inches (6 to 9 cm) in length and have a wingspan of about 8 inches (20 cm). Larger species range from 7 to 8 inches (18 to 20 cm) in length and have a wingspan between 21 and 23 inches (53 and 58 cm).