Page 9 - Bats of Oklahoma Field Guide
P. 9
Big Brown Bat
(Eptesicus fuscus)
Wingspan: 13 – 16 inches.
Total Length: 3.5 – 5.25 inches.
Color: Glossy chestnut brown above, paler below. Greg Sievert
Wings, tail, ears and nose are dark brown to black.
Over-Wintering Behavior: Hibernates.
Preferred Daytime Roost: Caves, buildings,
bat houses.
Evening Flight Time: About 20 minutes after sunset.
Feeding/Flying Behavior: Flight appears slow and
deliberate. May fly near roost before flying off to feed.
Pup Development Period: Late May to late July.
In Hand: It is large in size, with a forearm greater than 1.5 inches and a
distinctly keeled calcar.
Cool Fact: Females are larger than the males.
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