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In the area around the observation, both M. californicus and M. waterhousii could occur:
http://www.inaturalist.org/taxa/41146-Ma...
http://www.inaturalist.org/taxa/41147-Ma...
Please consider adding this spotting to the new North American Bat Tracker mission at http://www.projectnoah.org/missions/1830...
Great find! Common names don't mean much, but according to this site it's the California leaf-nosed bat: http://www.batcon.org/index.php/all-abou...
It's the only leaf-nosed bat found North of Mexico