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The little brown bat (sometimes called little brown myotis) (Myotis lucifugus) is a species of the genus Myotis (mouse-eared bats), one of the most common bats of North America. The little brown bat has been a model organism for studying bats.

As suggested by the bat’s name, its fur is uniformly dark brown and glossy on the back and upper parts with slightly paler, greyish fur underneath.Wing membranes are dark brown on a typical wingspan of 22–27 cm (8.7–11 in). Ears are small and black with a short, rounded tragus. Adult bats are typically 6–10 cm (2.4–3.9 in) long and weigh 5–14 grams (0.2–0.5 oz). Females tend to be larger than males.

The little brown bat lives in three different roosting sites: day roosts, night roost and hibernation roosts.Day and night roosts are used by active in spring, summer and fall while hibernacula are used in winter. Day roost sites are typically found in buildings, trees, under rock in wood piles and sometimes in caves. Nursery roosts are found in hollow trees and other natural crevices as well as around buildings. Nursery roosts have also been found under sheet metal roofs of trapper’s cachesand attics of buildings.Night roosts tend to be in the same buildings as day roosts, however these roosts tend to be confined spaces with many bats packing themselves together to increase roost temperature. Bats congregate in night roosts after feeding in the evening. Thus night roosting could result in the accumulation of feces away from the day roosts which could make the latter less conspicuous to predators.Brown bats usually hibernate in attics, ceiling voids, caves and sometimes abandoned mines. Northern populations of bats enter hibernation in early September and end in mid-May while southern populations enter in November and ends in mid-March.

Brown bats live approximately 6 to 7 years and often live well beyond 10 years.  Brown bats are also hosts for various parasites such as fleas, bed bugs and lice. Many states have made special considerations with respect to the disease, including listing them as a sensitive or protected species.