- Weight : 1/4 - 1/2 oz. (6-13 g)
- Body length: 3 - 3 7/8 in. (75-99 mm)
- Wingspan: 10-11 in. (26-29 cm)
- Forearm: 1 1/4 - 1 5/8 in. (31-40 mm)
The evening bat is a small bat with dark brown fur, and black on its ears, wings, and tail. Evening bats have relatively short ears and a blunt tragus which separates them from other similar species. Evening bats also have a pungent odor.
Evening bats are have medium to fast, erratic flight patterns but will occasionally fly slow.