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).

According to the National Park Service, white-nose syndrome is a disease that creates a visible white fungal growth on infected bats’ muzzles and wings ... The big brown bat is one of the ...