Big Brown Bat, Eptesicus fuscus, big brown bats, bat, bats, nocturnal, night animal, vespertilionid, vespertilionids, vesper, insectivore, insectivores, insectivorous, night flying, night flight, carnivore, carnivorous, carnivores, pest control, insect eating, beneficial, brown, fur, mammal, mammals, biosonar, echolocation, ultrasonic sound, ultrasonic sounds, fly, flying, wing, wings, winged, wing membrane, sound, sounds