ABSTRACT
Census methods describes most common and abundant species, Myotis lucifugus, the little brown bat. The species ranges from Newfoundland to Alaska on the north to California and North Carolina on the south. These bats hibernate in caves and abandoned mines from September to October through March to April. Females apparently enter hibernacula later and leave earlier than males. In the spring, the adult females gather in nursery colonies, located frequently in hot and poorly ventilated attics of buildings. The young are born and raised to the age of self-sufficiency during the summer in these colonies. The summer habitat and roosts for adult males is not well known. Apparently males roost singly or in small groups in various sheltered places. During the summer, adults of both sexes remain in their roosts during the day, moving out at night to feed. In late summer and fall, old and young of both sexes swarm near entrances to winter hibernacula.
