Abstract
Abstract Mexican Free-tailed Bats (Tadarida brasiliensis mexicana) from a bridge colony in Big Bend Ranch State Park, Presidio County, Texas were followed over two natal seasons sand two winters. For the period of this study, the bridge was being utilized as a maternity roost with a number of the young of the summer overwintering in each of the two winters examined. The site also was used by nonreproductive adult males during spring and summer. Adult bats left the bridge roost by mid-to-late summer, leaving only young of the summer at the bridge to exploit roost and local resources through the fall and winter. Young of the summer being left at the maternity roost to overwinter is a novel behavior for T. b. mexicana. Sex-and age-specific segregation of bats is inferred within the bridge roost.
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