Keen's myotis (Myotis keenii) is a species of vesper bat. It is found in British Columbia in Canada and in Washington and Alaska in the United States. It is named after the Rev. John Henry Keen, who collected the specimen that formed the basis for the first scientific description of the species. Classification for Keen's myotis formerly included the Northern long-eared Myotis (Myotis septentrionalis), resulting in older studies confusing the species for one another.
Measurements: Forearm 1.4-1.6 in., WT 0.25-0.33 oz (7-9 g). Average body length 8–9 cm, tail length 4–5 cm. In appearance, Keen's myotis is very similar to other long-eared bats of the same range, with characteristic dark brown patches on the shoulders.
Keen's myotis prefers coastal habitats, but is often found in urban areas as well. It frequently roosts in trees and rock crevices. It is nocturnal and insectivorous. Keen's Myotis probably exhibits the same breeding habits of other temperate vespertilionids, but there is little data available.
- Arroyo-Cabrales, J. & Ticul Alvarez Castaneda, S. (2008). "Myotis keenii". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved 8 February 2010.
- "Keen's myotis". State University of New York College of Environmental Science and Forestry. Retrieved 7 November 2010.
-  Arroyo-Cabrales, J.; Álvarez-Castañeda, S.T. (2008). "Myotis keenii". IUCN Red List of Threatened Species. Version 2014.3. International Union for Conservation of Nature and Natural Resources. Retrieved 30 November 2014.
- "Mammals of Washington". Burke Museum. University of Washington. Retrieved 9 Dec 2014.
- "Myotis Keenii". NatureServe Explorer. NatureServe. Retrieved 9 December 2014.
- "COSEWIC Assessment and Update Report on the Keen's Long-eared Bat Myotis Keenii in Canada" (PDF). Sera Registry. COSEWIC. 2003. p. iv. Retrieved 9 December 2014.
- Filla, Joe. "Myotis Keenii". Animal Diversity Web. University of Michigan Museum of Zoology. Retrieved 9 December 2014.
- "COSEWIC Assessment and Update Report on the Keen's Long-eared Bat Myotis Keenii in Canada" (PDF). Sera Registry. COSEWIC. 2003. p. v. Retrieved 9 December 2014.
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