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A big brown bat (Eptesicus fuscus) drinking water from a pond near Amado, Arizona . 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.