Eastern Bat ID Table

Home , Corynorhinus, Evening bat, Hoary bat, Northern yellow bat, Seminole bat

Characteristics of Eastern Bats

4arm Avg Weight Foot Ear Tragus Species Fur (mm) (gr) (mm) (mm) shape Calcar Other ID Traits

Brazilian Free-tailed Bat Short, brown to dark 43 11-14 8.6 19-20 Tail free from membrane (Tadarida brasiliensis) gray

Broad Rafinesque's Big-eared Bat Gray or brown above 41 8-14 8-13 27-37 and Huge ears (Corynorhinus rafinesquii) and whitish below Long

Broad Townsend's Big-eared Bat Clove-brown above and 43 9-13 9-13 27-39 and Huge ears (Corynorhinus townsendii) buffy below Long

Broad Big Brown Bat Long brown - two toned Large, prominent glands on 47 13-25 10-12 17-18 and Keeled (Eptesicus fuscus ) black base muzzle Rounded

Eastern Pipistrelle Sandy brown to orange Blunt and Not 33 4-7 8-10 13-15 Pink forearms, black wings (Pipistrellus subflavus) on back - tricolored, Straight Keeled

Dull brown with paler Strong odor!, prominent Evening Bat short and Not belly, young much 36 5-14 7-8 14-15 glands on muzzle single upper (Nycticeius humeralis) rounded Keeled darker incisor

4arm Avg Weight Foot Ear Tragus Species Fur (mm) (gr) (mm) (mm) shape Calcar Other ID Traits

Bright red or rust color, short, Red Bat Membrane between rear legs females with frosting, 40 8-16 9-10 8-13 blunt and (Lasiurus borealis) is completely furred males without curved

Mahogany brown with short, Seminole Bat Membrane between rear legs frosted tips above, paler 40 8-15 6-11 7-14 blunt and (Lasiurus seminolus) is completely furred below curved

Yellowish brown to dark short, Very large, membrane Hoary Bat brown with very heavy 53 20-35 6-13 17 blunt and between rear legs is (Lasiurus cinereus) frosted tips curved completely furred

Yellowish brown, no short, Northern Yellow Bat Membrane between rear legs white shoulder or wrist 48 14-20 10 ? blunt and (Lasiurus intermedius) is furred only on basal half patches no frosting curved

Silver-haired Bat Dark blackish brown, Blunt and Membrane between rear legs 41 7-16 7-11 14 (Lasionycteris noctivagans) with silver frosted tips rounded is furred on anterior half

4arm Avg Weight Foot Ear Tragus Species Fur (mm) (gr) (mm) (mm) shape Calcar Other ID Traits

Wing attached to ankle, all Gray Bat Solid gray above, paler Not 43 7-12 9-12 14-16 Sharp gray, rear claw has a notch in (Myotis grisescens) below Keeled it.

Wooly dull, little contrast between base Southeastern Bat and tips, yellowish to Slender Not Gray-black wings, long toe 40 5-12 10-13 13-16 (Myotis austroriparius) gray above, orangeish Pointed Keeled hairs in mid-late summer, white below

Long glossy tan to dark Long toe hairs (beyond Little Brown Bat Slender Not brown above, gray to 38 7-8 8-11 13-16 claws), contrasting wings with (Myotis lucifugus) Pointed Keeled buff below body,

short toe hairs, pink nose, Fine fluffy, not glossy Indiana Bat Slender uniform in color, wings do not dark gray to brown 38 5-11 7-10 11-16 Keeled (Myotis sodalis) Pointed contrast with body. Never has above, grayish below condensation in winter.

Very Northern Long-eared Bat Not glossy, brown Large propatagium, ears 35 5-10 7-10 16-19 Long and Keeled (Myotis septentrionalis) above, grayish below extend beyond nose (3mm) Slender

Eastern Small-footed Bat Blackish brown above, Sharply Black mask, longish tail (33 32 4-6 6-8 13-15 Sharp (Myotis leibii) paler below Keeled mm)

Roosting Seasons of Species Status Habits Cave Use

Brazilian Free-tailed Bat Large Common All (Tadarida brasiliensis) Clusters

Solitary or Rafinesque's Big-eared Bat Mostly Rare V. Small (Corynorhinus rafinesquii) winter Groups

Townsend's Big-eared Bat Solitary or in Endangered All (Corynorhinus townsendii) small clusters

Big Brown Bat Common Solitary Winter (Eptesicus fuscus )

Eastern Pipistrelle Common Solitary Winter (Pipistrellus subflavus)

Evening Bat colonial in Common Never (Nycticeius humeralis) trees

Roosting Seasons of Species Status Habits Cave Use

Red Bat Solitary in V Common Never (Lasiurus borealis) trees

Seminole Bat Solitary in Common Never (Lasiurus seminolus) trees

Hoary Bat Common, but Solitary in Never (Lasiurus cinereus) rarely caught trees

Northern Yellow Bat Solitary in ? Never (Lasiurus intermedius) trees

Silver-haired Bat Common in solitary or Occasionally (Lasionycteris noctivagans) spring and fall small groups

Roosting Seasons of Species Status Habits Cave Use

Small to Gray Bat Endangered Large All (Myotis grisescens) Clusters

Small to Southeastern Bat Rare Large All (Myotis austroriparius) Clusters

Little Brown Bat Small Tight Common Winter (Myotis lucifugus) Clusters

Small to Indiana Bat Endangered Large Tight Winter (Myotis sodalis) Clusters

Solitary or Northern Long-eared Bat Common V. Small Winter (Myotis septentrionalis) Groups

Eastern Small-footed Bat Rare Solitary Winter (Myotis leibii)