Brown Myotis Bat

Brown Myotis Bat

Scientific Name: Myotis lucifugus
Classification: Mammal - bat
Life Span: The lifespan has been known to reach over 20 years
Weight – 1/4 to 1/3 ounce


Hairs on the back have long, glossy tips giving the body a characteristic glossy sheen. The ears are medium-sized.



Little brown myotis are usually found in coniferous forest at higher elevations and higher latitudes near water. Hollow trees, buildings, rock outcrops, mine tunnels, and caves serve as roost sites.



The range covers most of the united states except for the extreme south and also most of canada. This species primarily inhabits the northern part of nevada.


Natural History:

Northern populations migrate south in the fall to hibernate in caves or mines. Little brown myotis form colonies, sometimes of more than 100 individuals. They leave their day roosts at dusk and return just before dawn.


Food Habits:

Little brown myotis feed on a variety of insects, mainly aquatic insects like caddis flies, midges, and mayflies. They catch prey while flying in open areas near vegetation, along water margins, and just above the surface of water.



One young, occasionally two, is born in may to july. The gestation period is approximately 80 days. Young fly and support themselves by about one month old. Adult females form maternity colonies during the breeding season of 100 to several thousand individuals. Males roost separately during this time, alone or in small groups.



The little brown myotis is currently unprotected in nevada.


Reason for Status:

This species is more common and more tolerant of human disturbance than other bat species in this region. Threats to the little brown myotis include timber harvest, pesticide use, loss of buildings and mines for roost sites, and cyanide ponding.


Management & Conservation:

More information is needed regarding the distribution and abundance of this species. Nevada recently completed the nevada bat conservation plan.