when do little brown bats come out of hibernation
Little brown bat The little brown bat lives in three different roosting sites: day roosts, night roosts, and hibernation roosts.[4] 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[5] and attics of buildings.[6] 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.[4] 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.[4] Little brown bats are true hibernators.[7] 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.[citation needed]