The California myotis is widely distributed across Arizona but rarely photographed, and its record trail reflects that. Open databases hold 512 occurrences for the species statewide, yet only 11 of those are iNaturalist photos. The rest come from museum and survey work, the way most bats enter the record: netted, measured, or logged by acoustic detector rather than caught on camera.
A tiny bat that ranges the whole state
This is one of Arizona’s smallest bats, a four-gram insect hunter with long, narrow wings built for slow, fluttering flight low over water and through cluttered vegetation. The county spread is genuinely statewide, from the low deserts of Mohave, Yuma, and La Paz to the Sky Island canyons of Pima and Cochise and up onto the Coconino plateau. That breadth fits a generalist that roosts in rock crevices, tree bark, and buildings and forages wherever night insects gather, especially along desert washes and streamside corridors.
The summer pulse in the record
Records climb steeply through late spring and peak in June and July, then fall away toward winter. That rhythm is the bat’s biology on display: warm nights bring an explosion of flying insects and the formation of maternity groups where females raise a single pup, so activity and detectability spike together. As nights cool, California myotis drift into torpor and hibernation in sheltered roosts, all but disappearing from the record until the following spring.
Common questions
Is the California myotis common in Arizona? It is widespread and, by conservation ranking, apparently secure across the state, but it is easy to overlook. Small size, nocturnal habits, and a preference for cluttered flyways mean it turns up far more often in a biologist’s net than in a hiker’s photo.
Full species profile
