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 onehunterman
Mar 1, 2026
Kristi Lynne Ln, Buffalo Mills, PA, US
byonehunterman
Research Grade
· 1 ID
Big Brown Bat observed by allyoutdoors
Feb 28, 2026
Middlesex, CA-ON, CA
byAlly
Research Grade
· 2 IDs
Big Brown Bat observed by erinhenson
Feb 27, 2026
John Carroll University (US-OH)
byErin Henson
Research Grade
· 1 ID
Big Brown Bat observed by ptcrawford
Feb 23, 2026
US-412 W, Sand Springs, OK, US
byPhillip T. Crawford
Research Grade
· 1 ID
View all 7,098 observations on iNaturalist
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