Townsend's big-eared bats are mainly found on the west coast of North America, from British Columbia to Oaxaca, Mexico. Physical Characteristics Plecotus townsendii is a medium sized bat.
Females weigh more than males in the fall and winter.
The ears of this bat range in size from 30 - 39 mm . The bases of the dorsal hairs are either slate or gray in color with tips varying in color from pale cinnamon brown to blackish brown. The bases of the ventral hairs are the same and the tips range from brown to buff . Townsend's big-eared bats are also distinguished by two large lumps on the back and side the snout. These bats are insectivorous.