Townsend's Big-eared Bat


Townsend's big-eared bat being weighed and measured

Townsend's big-eared bat (Corynorhinus townsendii), is blue listed (at risk) in British Columbia. A nursing female will consume her weight in insects each night, which is equivalent to an adult human eating 230 hamburgers in 6-8 hours!

Map

Biodiversity Interactive Map - Townsend's Big-eared Bat

Range

  • From southern Mexico through the western United States into southern British Columbia.
  • Populations occur throughout the Columbia Basin (Cranbrook, Creston, Castlegar, Trail, Slocan Valley)

Habitat

  • Occurs in a wide variety of habitats (upland, wetland, dryland and riparian) primarily at low elevations
  • Prefers relatively cold places with stable temperatures throughout winter for hibernation.
  • Maternity roosts found in caves and anthropogenic structures

Reproduction

  • Mating occurs in November through February in the hibernacula.
  • Females form maternity colonies of a dozen to several hundred, and give birth to their single young after gestation of 50-100 days.  Delayed implantation of the fertilized egg in the wall of the uterus can increase this gestation period so that births occur at a time when survival of the young is most likely.
  • They form tightly packed clusters in order to reduce heat loss and thus promote rapid development of the young.

Listing and Date

Listing Date
B.C. List Blue 2000
COSEWIC
SARA S3 2006

Threats to Species

  • Loss of foraging and roosting habitat through land development (agriculture, reservoir creation, mine deactivation)
  • Disturbance at maternity roosts and hibernation sites

Select Reports

Full Report Listing (most recent on top)

For more information on this species, visit The BC Species and Ecosystem Explorer and enter "Townsend's big-eared bat" in the Species Name field.

 

 

SPECIES

Amphibians
Columbia Spotted Frog
Long-toed Salamander
Northern Leopard Frog
Western Toad

Birds
Common Nighthawk
Great Blue Heron
Harlequin Duck
Lewis’s Woodpecker
Northern Goshawk
Sharp-tailed Grouse
Vaux’s Swift
Western Screech Owl
Yellow Warbler
Yellow-breasted Chat

Fish
Bull Trout
White Sturgeon

Flora
Common Camas
Whitebark Pine

Mammals
Badger
Big Brown Bat
Rocky Mountain Bighorn Sheep
Elk
Grizzly Bear
Selkirk Least Chipmunk
Moose
Mountain Caribou
Mountain Goat
Mule Deer
California Myotis
Fringed Myotis
Little Brown Myotis
Long-eared Myotis
Long-legged Myotis
Northern Myotis
Yuma Myotis
Silver-Haired Myotis
Townsend's Big-eared Bat
White-tailed Deer
Wolverine
Yellow-pine Chipmunk

Reptiles
Western Painted Turtle
Western Yellow-bellied Racer
Western Skink

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