Photo Credit: John MacGregor USFS

Keen's Myotis

Myotis keenii

Order: Chiroptera

Suborder: Yangochiroptera

Family: Vespertilionidae

Call characteristics:

High frequency caller (~40 kHz range)


3 1/2 in

(9 cm)


  1/5 - 1/3 oz

(6 - 9 g)

The Keen's Myotis is dark brown with long ears and fringe along the tail membrane. This bat is found in coastal forests of Washington, British Columbia, and Alaska. A maternity colony has been documented within rock crevices heated by hotsprings in Gwaii Haanas National Park but this species is typically observed roosting in tree cavities. The Keen's Myotis often feeds on spiders and moths and will consume a variety of flying insects. Classification of the Keen's Myotis previously included Myotis septentrionalis and more recently population genetics have concluded there is gene flow between Myotis evotis and Myotis keenii. Little is known about the life history of this species and many references to Keen's Myotis prior to 1993 are actually describing the northern long-eared bat.


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: John MacGregor USFS




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.