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in September, 1979. <br /> No Cooper's hawk nests were located on or near the study area during the field <br /> investigations in 1979. The Cooper's hawk is a tree nesting raptor, and <br /> comTonly nests in a large stand of cottonwoods along a stream (Call 1978) . <br /> Potential nesting habitat does not exist on the Nucla study area. Nesting <br /> opportunities exist in the cottonwood stands along the irrigation canal lo- <br /> cated approximately 1� miles east of the mine permit boundaries. <br /> Rough-legged hawk. Rough-legged hawks breed in Canada and Alaska and winter <br /> throughout western United States (Call 1978) . One rough-legged hawk was <br /> observed flying over the juniper habitat type approximately � mile south of <br /> the mine headquarters in January, 1980. This individual was' probably over- <br /> wintering in the area. <br /> American Kestrel. The Nucla study area occurs within the simmer and breeding <br /> range of the American kestrel. one kestrel was observed in the eastern boundary <br /> of the study area in September, 1979. Nesting habitat of this small falcon <br /> includes ledges on cliff faces (in treeless areas) and holes or cavities in <br /> trees (Call 1978) . No kestrel nests were located on or near the Nucla study area <br /> during field investigations in 1979. Potential nesting habitat in the study <br /> area exists in the trees along the riparian habitat and in the grove of trees <br /> north east of the farmhouse. <br /> Marsh hawk. The Nucla study area is occasionally year-round range of the marsh <br /> hawk (Robbins et al. 1966) Only one marsh hawk was observed during the field <br /> activities in 1979-1980. This individual was observed during the winter <br /> passerine transects over the alfalfa habitat type. <br /> Upland Game Birds. Only two gam birds appear to inhabit the study area: <br /> ring-necked pheasant and mourning dove. The occurrence, distribution and the <br /> seasonal use of the study area by these game birds and important game bird <br /> habitat (i.e. , nesting) is discussed below for each of the species observed. <br /> Ring-necked pheasant. The ring-necked pheasant is a year-round resident of <br /> -38- <br /> JUg i 1 t980 <br />