Natural, modified natural, and artificial cave entrances pose some of the greatest challenges in the management of karst resources because provision must be made for movement of air, water and wildlife within acceptable tolerances while simultaneously providing an adequate deterrent to illegal human entry. United States Fish and Wildlife Service approved bat gates have been installed on the entrances of caves supporting major bat hibernation areas. Cave gates are designed to accommodate bat movement, provide greater security, natural rates of air exchange and restore endangered Indiana and gray bat habitat. Airlocks have been installed on man-made entrances to restore cave atmospheric conditions.
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