 Like most bats, the Yuma Myotis will locate insects in flight by emitting ultrasonic sounds known as echolocation, then they either catch the insects in their mouths or use their tail membranes as a pouch to snag larger insect prey.Although their natural roosts include caves, rock crevices, and hollow trees, they are more commonly found today in artificial structures close to water.In suitable locations, they have been reported to establish colonies with as many as 10,000 members.