<P> The little brown bat can be distinguished from the Indiana bat by the absence of a keel on the calcar and long hairs on the hind feet that stretch longer than the toes . Compared to the long - legged bat, the brown bat has a shorter tibia and lesser amounts of ventral wing hair in addition to the lack of a keel on the calcar . </P> <P> The little brown bat lives throughout much of North America . It is most common in the northern half of the continental United States and southern Canada . Most specimens from the northern edge of its range are males although nursery roosts have been found in the Yukon . Brown bats have been found in Iceland, Alaska, and Kamchatka, likely due to accidental ship transportation by humans . </P> <P> The little brown bat lives in three different roosting sites: day roosts, night roosts, and hibernation roosts . Bats use day and night roosts during spring, summer, and fall while hibernacula are used in winter . Day roosts are usually in buildings or trees, under rocks or wood piles, and sometimes in caves . Nursery roosts are in natural hollows and buildings (or at least close to them). They have been found under the sheet metal roofs of trappers' caches and attics of buildings . Night roosts tend to be in the same buildings as day roosts, but these roosts tend to be in different spots that are more constrained; the bats pack together for warmth . Bats rest in night roosts after feeding in the evening which may serve to keep their feces away from the day roosts and thus less noticeable to predators . Brown bats typically hibernate in caves and perhaps unused mines . Northern populations of bats enter hibernation in early September and end in mid-May while southern populations enter in November and ends mid-March . Little brown bats are true hibernators . As observed in the Mid-Atlantic States during periods of warming during the winter, typically over 50 degrees (F), little brown bats emerge from their winter torpor and hunt insects that have emerged as well in response to the warmer conditions . </P> <P> Little brown bats are insectivores, eating moths, wasps, beetles, gnats, mosquitoes, midges and mayflies, among others . Since many of their preferred meals are insects with an aquatic life stage, such as mosquitoes, they prefer to roost near water . Brown bats forage near bodies of water and move in and out of adjacent vegetation . Evening forages are done in groups and above the water . They echolocate to find their prey . They are particularly good at hunting insects when they are at close range and packed together . When hunting, little brown bats capture prey both by gleaning and by catching them in the air . When in flight, bats scoop up the prey with their wings, while prey above water is directly grabbed with the mouth . </P>

When do little brown bats come out of hibernation
find me the text answering this question