Myotis auriculus. southwestern myotis.Bruce_D_Taubert.jpg

Photo Credit: Bruce D. Taubert

Southwestern myotis

Myotis auriculus 

Order: Chiroptera

Suborder: Yangochiroptera

Family: Vespertilionidae

Call characteristics:

High frequency caller (~40 kHz range)

Body Length

  3 - 3 1/2 in

(7.8 - 8.8 cm)


  1/5 - 1/3 oz

(5 - 8 g)

Conservation Status

Canada Species at Risk

Southwestern myotis have dull brown fur, with brown wing membranes and ears which distinguish them from other Myotine bats in the southwestern U.S.; all of which have black wing membranes and ears. Its range extends south from New Mexico and Arizona into Mexico and Guatemala. Preferred habitat consists of dry forests and shrublands, ranging from ponderosa pine to mesquite. Southwestern myotis are often found in areas with rocky cliffs, and maternity colonies have been documented in hollow tree cavities. Its diet consists mostly of moths. Females give birth to a single pup each season.


There are various sources for bat species range maps including IUCN, NatureServe, U.S. Fish and Wildlife Service ECOS, and the National Atlas of the United States (left). 


Photo Credit: Johnida Dockens




NABat utilizes monitoring data provided by a broad network of partners to support regional and range-wide inferences about changes in the distributions and abundances of bat populations facing current and emerging threats.

Information used to populate this page was obtained from the following sources:


NatureServe Explorer

United States Fish and Wildlife Service Environmental Conservation Online System 

Bat Conservation International Bat Profiles

National Atlas of the United States. (2011). North American Bat Ranges, 1830-2008. National Atlas of the United States. Available at:

Taylor, M. 2019. Bats: an illustrated guide to all species. Washington, DC: Smithsonian Books.