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the capture rate was 25.0 animals per 100 trap nights. As in most • <br />habitats, the deer mouse was the most abundant species in mountain <br />brush. Capture rates for montane voles, masked shrews, and least <br />chipmunks were approximately equal (Table 12). A single long-tailed <br />vole was captured in mountain brush. <br />Sagebrush <br />Only four species were captured in sagebrush; the capture rate <br />was 22.9 individuals per 100 trap nights. These modest figures could <br />easily be the result of the relatively low complexity of this habitat. <br />Deer mice accounted for 71X of the captures in this habitat. The <br />second most abundant species was the montane vole. A few masked <br />shrews and western dumping mice were also caught (Table 12). <br />OTHER MAMMALS • <br />In addition to big game and small mammals, a number of other <br />mammal species were encountered during baseline studies. Some of <br />those were directly observed, while others were identified by sign. A <br />list of mammals expected to occur in the Yoast area is presented in <br />Appendix 71-I. <br />The most commonly observed mammal, by far, was the porcupine <br />(Erithizon dorsatum). Porcupines were commonly observed year-round; <br />but in winter, with no leaves to obscure the view, up to 15 per day <br />were recorded. Mountain brush was the habitat most frequently used, <br />although porcupines were also observed in aspen, grass-forb meadows, <br />and bottomland meadows. <br />Yellow-bellied marmots (Marmots flaviventris) were occasionally <br />observed in bottomland and aspen habitats. Sightings of marmots were • <br />46 <br />