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Colorado and are, in general, sum-~~r residents. Although <br />none were seen during the October field work, four flycatchers <br />~,.~~ are likely to be found on the site during sum-ner: Dusky <br />flycatcher, Hammond's flycatcher, western wood pewee, and <br />Say's phoebe. All are breeding summer residents in the <br />Williams Fork Mountains. Say's phoebes breed on cliffs, <br />rocky outcroppings or sinilar vertical surfaces and probably <br />nest on the outcroppings of Twenty-mile Sandstone near the <br />site. Actual use of the site by these phoebes is probably <br />limited to feeding. ' <br />The two small Empidonax flycatchers (dusky and Hammonds) <br />are extremely similar in size and general foraging behavior. <br />However, Hammond's flycatcher prefers riparian shrub <br />habitats and is probably restricted to Hayden and <br />Dowden Gulches, which drain the site. The dusky flycather <br />prefers mountain shrub habitat and most likely uses the <br />site for all habitat requirements. The Colorado Division <br />of Wildlife has designated dusky flycathers as a non-game <br />species in Routt County to be used as an indicator species <br />Eor land use planning purposes. Although data collection <br />of the dusky's population densities and land habitat <br />requirements are not completed, the Division of Wildlife <br />estimates the present population status of this flycatcher <br />is good. <br />Preferred habitat of the western wood pewee is <br />open forests; the shrubby habitat of the study site would <br />be marginal. However, a few pewees may breed in the oak <br />and asn~n stands. <br />Larks <br />Horned larks are year-round residents in the Williams <br />Fork Mountains; several were seen on the study site. Since <br />horned larks nest on the ground in open grasslands, they <br />probably use the der_sely shrub-covered site only for <br />foraging.' <br />$Wa110W5 <br />Five species of swallows occur in the Williams Fork <br />Mountains as summer residents; none were seen during the <br />October fieldwork. The sharp escarpments of Twenty-mile <br />Sandstone near the study site are excellent nesting sites <br />for violet-green and cliff swallows. Both species could <br />be expected to forage over the study site. Rough-winged <br />swallows nest in burrows in steep clay e_*nbankments, which <br />are not common in the vicinity of the study site; a few <br />rough-winged swallows might forage over the site. Barn <br />swallows frequently nest under overhangs on Large buildings, <br />~` <br />_~ <br />.~ <br />:~ <br />.~ <br /> <br /> <br /> <br />i~ <br /> <br />r! <br />.1 <br />i <br />L <br /> <br />-56- <br />