They do not get in women's hair. They do not distribute our kind of bed bugs. But they can fly through timber or the narrow twisting passages of caves in total darkness because they have radar, Bats have large specialized ears, Their squeak is pitched so high that few people can hear it, As they fly they also make a supersonic squeak about 30 times per second and are guided by the echoes bouncing back from obstacles. Of the cave-dwellers, the commonest is the Little Brown Bat. In winter, most of them hibernate in caves, hanging head-down from the ceilings and walls in clusters of thousands.
Most bats have only one young per year.
When born it is one-fourth as large as mamma, and she carries it with her as she flies, until it gets too large and heavy. One of the tree-dwelling bats, a female with four young ones clinging to her, was found stranded on the ground. An old bat on a bat gets bats in her belfry. Argonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.