The Indiana bat and gray bat have been classified as endangered species. These bats are colonial hibernators, usually roosting in caves. It is unlikely that these species affect the general public, since they are seldom in conflict with man's interests. However, spelunkers have been known to disturb colonies to the point that the bats abandoned their cave. The little brown bat and big brown bat are the species most commonly found in buildings.
Female bats occupy nursery colonies in late spring or early summer when they give birth to young.
Within a month, the young make feeding flights, but the colony may remain until fall dispersal to hibernation caves. Few bats overwinter in buildings. Control Because of their insectivorous habits, bats are beneficial. Bats do not destroy property by gnawing or chewing. They occupy a special place among mammals because they can fly.