Idaho has only 12 big brown bat records, spread thinly across ten counties from Bonner in the panhandle, which has three, south to Ada and Bannock, with one at Lucky Peak State Park. Across that range this bat roosts in rock crevices and old buildings alongside natural cavities.
Reports fall between May and September, with July the busiest month, when maternity colonies are most active and young bats begin flying, though so few records can’t pin down timing with any confidence. NatureServe ranks the species S3, Vulnerable, in Idaho, a more cautious grade than this widespread species often carries elsewhere.
Full species profile
