Western little brown myotis has no confirmed occurrence record in this Arizona dataset, tying it for the rarest position statewide. The species’ core range and its steepest declines are farther north and east, where white-nose syndrome has devastated hibernating colonies; Arizona sits at the marginal southern edge of its range.
A zero-record showing here is consistent with a species that was never common in Arizona to begin with, layered on top of the sharp, ongoing declines that have earned it a global Endangered listing from the IUCN.
Full species profile
