The objectives of the 2002 mammal and herpetological inventory at the Big Hole National Battlefield were to: (1) Document at least 90% of the mammal species and reconfirm the presence of amphibian and reptile species expected to occur in the battlefield; (2) Gather baseline data for use in future monitoring; and (3) Collect and disseminate new information on the distribution, habitat association, and population status of the mammal and herpetological species of the region.