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Other mammals; A variety of rodents, insectivores, bats, and skunks is found within the subject area. Small mammals were trapped on the neighboring Energy Fuele property by Dames and Moore (6-8 August 1975) using'Sherman live traps. Four 12x12 grids (144 Sherman live traps per grid) were placed in each representative cover type, namely aspen, mountain shrub, sagebrush, and grassland. In addition to iden- tifying weighing, and recording the reproductive status of cap- tured animals, vegetation at each grid site was sampled to compare mammalian diversity with cover types. Twenty-one mammal species were recorded during the study.. Aspen and mountain shrub types had the greatest species comp- osition, with 14 and 13 species respectively. Eight species were identified in sagebrush habitat, and only two in grass- . land. Mountain shrub and aspen areas appear to support a more diverse mammal fauna than do sagebrush or grassland, because a greater array of microhabitats is associated with woodland growth-form and food resource. Many mammals utilize more than o.ne community, All species were trapped in the aspen and mountain shrub areas, but only deer mice were trapped in sagebrush and meadow communities. Since the. diversity was. greatest in mountain shrub followed by aspen woodlands, these communities must be considered more important habitats for small mammals than sagebrush or meadows. The diets of the six species trapped in mountain shrub type ranged from animal matter to seeds and vegetation, suggesting that not only a diverse .habitat exists, but a diverse food resource base. Unlike the woodland communities, sagebrush and meadows are more open and more restricted in growth-form. The deer mouse, a predominantly seed-eating species although weakly omnivorous, . was the only species to appear in these communities. 120