The big brown bat is the Adirondack’s largest bat; only the hoary bat is larger. The long, lustrous fur is brown. The ears, wing and tail membranes are black. Total length is 105-123 mm (4.1-4.8 in).

Their fur is light to dark brown, and their bellies are tan. They have a sizeable wingspan as well, measuring some 12 to 13 inches. The Ozark big-eared bat feeds ... baby, or pup, is born in ...