The Evening Bat Nycticeius humeralis Back to Meet Some Bats Evening bats are found throughout the southeastern United States, from southern Pennsylvania to Florida. They range northward in the central states to Nebraska, Iowa, Michigan, and Ontario and eastward into Ohio. It is absent or scarce in the western part of the Appalachians in Kentucky, Ohio, and West Virginia.
Evening bats enjoy roosting in buildings and tree cavities in the summer.
Maternity colonies sometimes consist of hundreds of female bats. Smaller colonies have been found behind the loose bark of dead pines and in hollow trees. Evening bats are one of the few bats which almost never enters caves, although they sometimes join the bats swarming about certain entrances in late summer. Young ones are born in nursery colonies where females congregate together. The usual litter size is two.