 The mother initially carries the young about with her as she forages, but after a few days, begins to leave them behind at the roost, where other adults in the harem tolerate their presence, and young may even cling to the harem male.They are able to fly at five to six weeks of age, and are fully weaned by three months.Young bats make ultrasonic distress calls if separated from adults, but do not begin to make echolocation calls until about ten days after birth.