From Alabama Wildlife (2004):
Big Brown Bat, Eptesicus fuscus
Found statewide and common. Roosts typically in human-made
structures, but also in caves, mines, hollow trees, and crevices,
or behind loose bark. Commonly inhabits bat houses, attics, and
louvered attic vents. Copulates in autumn and winter, ovulation
occurs in spring, and two young are born in late spring. Diet
consists primarily of beetles, but flies, moths, bugs, and
cicadellids also consumed. Lowest Conservation Concern.