North American Bat Species Visual ID

Image To Species ID Practice

20 - 35g, furred plagiopatagium, propatagium, and uropatagium. Honey color “collar”, silver top coat and dark grey undercoat. General Forearm 42 - 59mm.

Lasiurus Cinereus(Hoary Bat)

7 - 15g, Sparse lower third of uropatagium dorsal hair, with generally less white frosting and sexual dimorphism. General Forearm 36 - 46mm.

Lasiurus blosseveli(Western Red Bat)

12 - 20g, completely furred uropatagium, darker yellow base pelage. General forearm <=50mm.

Lasiurus Xanthinus(Western Yellow Bat)

17 - 28g, upper half of uropatagium furred, lighter yellow base pelage. General forearm >=50mm.

Lasiurus Intermedius(Northern Yellow Bat)

7 - 16g, Some sexual dimorphism with males redder, frosted donuts, fully furred uropatagium. General Forearm 35 - 47mm.

8 - 12g, Silver top coat with dark to black undercoat. General Forearm 37 - 44mm

Lasionycteris Noctivagans(Silver-haired Bat)

7 - 16 g, Grey dorsal pelage that maybe russet in the summer. Forearm 40-46mm. Plagiopatagium attaches at ankle.

Myotis Grisescens(Gray Bat)

4 - 9g, grey to orange with females sometimes brighter than males. Winter pelage has distinct color difference between ventral and dorsal. Forearm 31 - 42mm. Toe hairs extend past claws. Plagiopotagium attaches to foot just before toe.

Myotis austroriparius(Southeastern Myotis)

Myotis leibii(Eastern small-footed myotis)

Perimyotis subflavus(Tri-colored bat)

Myotis septentrionalis(Northern myotis)

Little brown bat(Myotis Lucifiugus)

Myotis sodalis(Indiana bat)

Nycticeius humeralis(Evening bat)

Molossus molossus(Velvety free tailed bat)

Corynorhinus rafinesquii(Rafinesque’s big eared bat)

Eptesicus fuscus(Big brown bat)

Tadarida brasiliensis(Brazilian free tailed bat)

Eumops floridanus(Florida bonneted bat)

Myotis yumanensis(Yuma myotis)

Myotis californicus(California myotis)

Parastrellus hesperus(Canyon bat)

Myotis ciliolabrum(Small footed myotis)

Myotis volans(Long legged myotis)

Myotis evotis(Long eared myotis)

Corynorhinus townsendii(Townsend’s big eared bat)

Nyctinomops femerosaccus(Pocketed free tailed bat)

Antrozous pallidus

Myotis thysanodes(Fringed myotis)

Nyctinomops marcotis(Big free tailed bat)

Eumops perotis(Mastiff bat)

Euderma maculatum(Spotted bat)