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which the nt=�duvw vole was encountered. It was Ulu mDst al)w�L::lnt skies <br /> captured in riparian (3.8 individuals/100 trap nights) and second most <br /> abundant species over all habitat types (0.3 individuals/100 trap nights) . <br /> The sex ratio of rreadow voles was 0.33 males and 0.67 females. <br /> The house muse was captured only in the riparian habitat. House mice <br /> oanmonly inhabit houses and outbuildings; however, they also inhabit grain <br /> fields and fence rows (Lechleitner 1969) . In colder months, the house <br /> muse may migrate into cheellings . A refuse dump located adjacent to the <br /> riparian habitat type probably supports a large population of house mice. <br /> The total relative abundance of the house muse over all habitat types was <br /> 0.4 individuals/100 trap nights and the sex ratio was 0.50 males and 0.50 <br /> females. The house mouse by virtue that all observations occurred in riparian <br /> habitat, showed an affinity for this type. <br /> Western harvest mice are most cften found in dense grassy or weedy areas, and <br /> often in riparian situations (Lechleitner 1969) . Food sources of this <br /> rricrotine include seeds, green portions of plants,and insects. Only one <br /> western harvest mouse was captured in the study area. This individual (male) <br /> was captured in the riparian habitat type. The total relative abundance <br /> of this species over all types was 0.2 individuals/100 trap nights. <br /> Other Mammals. Small and medium-sized manual species not captured in live <br /> traps but whose presence on the Nucla mine site has been substantiated during <br /> other field activities inciude the following species: desert cottontail <br /> (Sylvila(7us audu bonii) , muskrat (Ondatra zibethicus) , and Gunnison's prairie <br /> dog (2E2nLs crunni soni) . <br /> The desert cottontail appears to be very common in the study area. Five cotton- <br /> tails were observed during the 1979-1980 field season. The habitat of the <br /> desert cottontail includes a variety of ecological situations (e.g. , desert, <br /> grassland, shrubland, and riparian) . Cottontails were observed on the study <br /> area in the upland sagebrush, riparian and grassland pasture habitat types. <br /> One rmskrat was obsenped in the riparian type durincT April , 1979. Muskrats <br /> are aquatic mammals, livinq in streams, lakes, ponds and swams (Techleitner <br /> -30- <br /> J U N 1 1 1980 <br />