Subspecies: T. b. Mexicana (migratory)
T. b. cynocephala (non-migratory)
Wingspan: 11–14 in.
Length: 3½–4 in.
Weight: 0.28–0.49 oz
Color: Gray or dark brown to rusty brown
Other: Large round ears and vertical wrinkles on upper lip; tail projects beyond the tail membrane for about a third of its length
Roosting behavior: Can maintain mega-colonies of more than 1 million bats.
Human encounters: The species most likely to encounter humans. Lives in bridges, buildings, and any abandoned structure. Will occupy bat houses