Gray Myotis

Myotis grisescens

Order: Chiroptera

Suborder: Yangochiroptera

Family: Vespertilionidae

Call characteristics:

High frequency caller (~50 kHz range)

Body Length

3-4 in

(7-10 cm)


1/4 - 5/8 oz

(7 - 16g)

The gray Myotis has light to dark brown fur with long, dark ears. Ears are longer than many other Myotis species, extending 1/4 cm (7 mm) beyond the nose when laid forward and featuring a long and thin tragus. The gray Myotis has a keeled calcar. When foraging, gray Myotis prefer to feast on flying insects like mayflies and beetles. This species almost exclusively roosts in caves throughout the year. In the summer, they can be found in warmer caves located in close proximity to water sources. In winter, the species prefers cool, deep, well aerated caves. Appropriate cave temperatures are essential for hibernation and rearing young. During winter, it is estimated that 95% of the known population of gray Myotis occur in just nine caves.

Conservation Status

Canada - not present
Mexico - not present
Image by Niclas Dehmel


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). 




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.