Western Mastiff Bat (Eumops perotis)
Away from human habitations, this bat generally seeks diurnal refuge in crevices in rocks that form vertical or nearly vertical cliffs. The roost entrances typically are horizontally oriented, have moderately large openings, and face downward so they can be entered from below. In Capote Canyon in Presidio County, Texas, these bats were found utilizing a crevice formed by exfoliation of the nearly vertical rim rock.
