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1 ~' of .the study site. Because coniferous forests are the coiiunon nesting habitat for western tanagers, it is unlikely ~ that they nest on the site. /_ ~. Towhees, Juncos, Sparrows, and other Fringillids Two species of towhees are summer residents in the ~ Williams Fork hiountains. The rufous-sided towhee is z • common breeding bird in r..ountan shrub habitat and is ti expected to nest on the study site. Green-tailed towhees i prefer riparian habitats and may nest in the willo:v } thickets zlong Hayden and Do;vd~n Gulches. Neither species _ was seen during the faunal surveys. ~. During winter large flocks of pine siskins are reported in the Williams Fork ~?ountains, but the mountain shrub vegetation does not provide suitable nesting sites 4! for this species. _ Black-head_d grosbeaks and Lazuli bunting's zre suanmer ~ residents in the vicinity of the study site. Lazuli buntincs • are reported to breed in the shrub habitat c'raractzristic of the study site and probably nest on the site. Blzck- ~ head~d grosbeas, however, probably use the site only for . foraging, since this species typically nests in coniferous forests. , :; F': Pine grosbeaks bree3 'in subalpine fordsts and are not probable breecers on the study site. However, they mzy utilize tiie site for winter foraging. ~)~' Dark-eyed juncos warn abundant on the study site _ during the Octcber surveys, particularly in the ci•.o'recherry- , ' snowberry plant cor•~unity, and are prcbable breed=rs on ~ ;- t'~e site. They are year-round residents in the area, although their numbers increase in winter due to an influ:c '1' ~ of wintering birds from farther north. ~ Only one sparro:v (white-cro:,m_ed sparrow) was seen •~ during the October surveys. A1tP.ough it is a year-round resident o£ the area, it most likely does not breed on tae study site. At lezst three other sparrow species inhabit ~;~ the area. Chipping and Brewer's sparrows are common summer 1' ~ visitors to the region. The Brewer's sparrc:v mzy nest on _• r the site in sagebrush communities, its preferred habitat. _ The song sparrow, a yeah-round resident of the region, may ~ forage on the study site, but is not a probable breeder. ~ _ - This common Species prefers moist arezs with heavy brush '- and may find adequate nesting habitat in Hayden and Do:vden ' Gulches. A fourth sparrow, the vesper sparrow, may _ ~ occasionally Forage on the site. Vesper sparro:•:s bree3 in :., the Williams Fork Kountains.~n early summer. However, these ~~ ~., -59-