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Photo credit: Ernie Valdez

Idionycteris phyllotis

Order: Chiroptera

Suborder: Yangochiroptera

Family: Vespertillionidae

Call characteristics:

Low frequency caller (~25 kHz)


  1/4 - 1/2 oz

(8 - 16 g)

Body Length

 4 - 4 2/3 in

(10.3 - 11.8 cm)

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

Allen's Big-eared Bat

Allen's Big-eared Bat

Allen's big-eared bat has long, dark brown fur with lighter tips and a black patch on each shoulder. This species has very long (1-1.5 in) ears! The species is often associated with pinyon pine, ponderosa pine, juniper, and oak and includes desert mountains in the southwestern US and Mexico. Maternity colonies have been observed in mines and dead trees. Allen's big-eared bats prefer to eat moths but also consume other flying insects. Mothers have one pup per year. 

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.

Conservation Status

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