The young bat is left behind while the mother goes out on nightly food foraging flights. Using their amazing sonar ability to maneuver in the dark, the bat catches food while flying. Passing up insects that humans consider beneficial, bats eat only insects that are considered pests. In one hour a bat can eat 600 mosquito-sized insects. A bat emits high-frequency sounds that bounce back to its ears, enabling it to detect in total darkness objects as fine as a human hair.
Humans pose the greatest threat to bats.
People kill bats because of fear, and don't understand their importance. Disturbance of colonies causes many dangers to the bats. Disturbance of hibernating colonies can cause the bats to awaken and deplete the fat reserves they need to live through the winter. Disturbance of maternity colonies is also harmful because adult bats may drop their flightless young or abandon them. Established bat colonies may abandon a favored site after repeated disturbances by humans.