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).

The Ozark big-eared bat is a threatened species found only in ... Mating among these bats is initiated with ritualized calls and affectionate head nuzzling. The female stores the male’s sperm ...