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).

Shelly Colatskie, a bat ecologist for the Missouri Department of Conservation, identified the flying mammal in Manzo’s room as a big brown bat. “They’re harmless to humans,” Colatskie said.