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 ptcrawford
Apr 17, 2026
United States
byPhillip T. Crawford
Research Grade
· 1 ID
Big Brown Bat observed by ptcrawford
Apr 16, 2026
United States
byPhillip T. Crawford
Research Grade
· 1 ID
Big Brown Bat observed by ptcrawford
Apr 16, 2026
United States
byPhillip T. Crawford
Research Grade
· 1 ID
Big Brown Bat observed by ptcrawford
Apr 16, 2026
United States
byPhillip T. Crawford
Research Grade
· 1 ID
View all 7,263 observations on iNaturalist
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