Townsend's Big-Eared Bat
Townsend's big-eared bats range in weight between 8-14 grams. They have a wing span of 12-13 inches (30-34 cm). Townsend's bats can be differentiated from Allen's big-eared bats by looking for the absence of flaps of skin near the front of the base of their ears and the presence of glands on the nose. Townsend's bats can also curl their ears backward so they have a ram-horn appearance.
The Townsend's big-eared bat's range covers southwestern Montana, Idaho, Wyoming, Utah, western Colorado, Arizona, and New Mexico.
Ecology and Behavior
Females tend to form maternity colonies in caves, mines, or buildings but males will stay solitary. Unlike most other microbats, females prefer to have cooler temperatures in their maternity colonies.
They will hibernate in caves and mines in small groups but are mostly found singly. Individuals will also move during the winter hibernation within caves or from one cave to another.
Red dots indicate captures prior to 2009 and yellow dots indicate captures after 2009. The yellow line separates the Great Basin ecoregion on the left from the southern Rockies region on the right.
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