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).

Every fall, these big brown bats (Eptesicus fuscus ... With a half-dozen grumpy bats bagged, Slack, Barton and several co-workers lug their gear to the cave’s Rotunda Room, where the limestone ...