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 henk26879
Jan 13, 2026
Camden Cope, Peachtree City, GA, US
byHenk den Bakker
Research Grade
· 1 ID
Big Brown Bat observed by pandapown
Jan 13, 2026
Middlesex County, US-MA, US
bypandapown
Research Grade
· 1 ID
Big Brown Bat observed by t-himelspach
Jan 13, 2026
Reservoir Ln, Richmond, VA, US
byTess Himelspach
Research Grade
· 1 ID
Big Brown Bat observed by xander_737
Jan 11, 2026
Longwoods Rd, Chatham-Kent, ON, CA
byAlexander Campbell
Research Grade
· 1 ID
View all 6,972 observations on iNaturalist
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