Of the world’s 1,400 bat species, only eight live in Minnesota. Four of the eight spend the winter hibernating The big brown bat is one of MInnesota's eight known bat species and one of four ...

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).