The little brown bat’s Iowa record shows one of the starkest source imbalances in this rank tier: 133 GBIF records against just 7 from iNaturalist, meaning hibernaculum and cave surveys, not casual sightings, document nearly everything known here. NatureServe still rates the state population S4, apparently secure, though the species’ global IUCN Endangered status reflects the devastating impact white-nose syndrome has had on this species across most of its range since the disease first appeared.
Records are thin and concentrated in early fall, September and October together account for 3 of the 4 monthly-tallied sightings, tracking the pre-hibernation swarm period when bats gather near cave entrances and are briefly easier for surveys to detect.
Full species profile
