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Big Brown Bat
(Eptesicus fuscus)
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| Colonial |
Weight
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1/2 - 5/8 oz. (13-18 g) |
| Body Length |
4 - 5 1/8 in. (103-130 mm) |
Wingspan
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13-16 in. (32-40 cm) |
| Forearm |
1 3/4 - 1 7/8 in. (45-48 mm) |
| Recognition |
Glossy brown-copper fur.
Belly paler.
Wings/interfemoral membrane black.
Tragus short, broad and rounded.
Face/ears broad and black.
Keeled calcar. |
| Similar Species |
Evening Bat much smaller.
Myotines (genus Myotis) usually smaller, with 2 tiny premolars behind canine and longer, thinner tragus. |
| Summer Roosts |
Buildings, under bridges, hollow trees, beneath loose bark, behind shutters. |
| Winter Roosts |
Buildings, caves, mines. |
| Eats |
Beetles, ants, flies, mosquitoes,
mayflies, stoneflies, other insects. |
| Call |
.wav file
Courtesy of Bat Call: Acoustic Call Library and Species Accounts
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Spectrograph
Courtesy of Bat Call: Acoustic Call Library and Species Accounts
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Big Brown Bat
Photo by:
Dr. J. Scott Altenbach
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