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 woodsarmoury
Jun 2, 2026
Groveton Rd, Edwardsburgh/Cardinal, ON, CA
byJohn K Woods
Research Grade
· 1 ID
Big Brown Bat observed by ibeach330
Jun 1, 2026
Holland Dr, Santa Rosa, CA, US
byibeach330
Research Grade
· 1 ID
Big Brown Bat observed by elliotty
May 31, 2026
Chatham-Kent, CA-ON, CA
byElliott Yong
Research Grade
· 1 ID
murciélago moreno norteamericano observed by diegoivancornejo
May 30, 2026
Nipinnawasee, CA 93601, USA
bydiegoivancornejo
Research Grade
· 1 ID
View all 7,412 observations on iNaturalist
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