Big Brown Bat

The Big Brown Bat (Eptesicus fuscus) is larger in size than comparative species of bats, from about 4 to 5 inches (10 – 13 cm) in body length, with a 11-13 inch (28 to 33 cm) wingspan and weighing 1/2 to 5/8 ounce. The fur is moderately long, and shiny brown. The wing membranes, ears, feet, and face are dark brown to blackish in color.

Big brown bats are nocturnal, roosting during the day in hollow trees, beneath loose tree bark, in the crevices of rocks or in man-made structures such as attics, barns, old buildings, eaves and window shutters. Big brown bats navigate through the night skies by use of echolocation, producing ultrasonic sounds through the mouth or nose. Big brown bats are known also to produce audible sound during flight. Its voice is a click or a sound like escaping steam.