Big Brown Bat

Eptesicus fuscus

The big brown bat is a species of vesper bat distributed widely throughout North America, the Caribbean, and the northern portion of South America. Compared to other microbats, the big brown bat is relatively large, weighing 15–26 g and possessing a wingspan of 32.5–35 cm.

Baby Season
Summer (May-July)
Big brown bat in flight in Prospect Park, Brooklyn. Photo shared on Wikipedia by Rhododendrites.
Big brown bat in flight in Prospect Park, Brooklyn. Photo shared on Wikipedia by Rhododendrites.
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Community Sightings

Recent observations from the iNaturalist community

Big Brown Bat observed by rmjk
Jul 17, 2026
Hunt Club / Bank, Ottawa, ON K1V 0T7, Canada
byrmjk
Research Grade
· 1 ID
Big Brown Bat observed by samsonjs
Jul 17, 2026
University of Nebraska–Lincoln, Lincoln, NE, US
byJack Samson
Research Grade
· 1 ID
Big Brown Bat observed by christian_nunes
Jul 16, 2026
Boulder, CO, US
byChristian Nunes
Research Grade
· 1 ID
Big Brown Bat observed by isa0004
Jul 16, 2026
Lower Nazareth Township, PA, USA
byIsabella Velez
Research Grade
· 1 ID
View all 7,611 observations on iNaturalist
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