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habitat preferences and recent sightings in the area (Bailey <br />3 and Neidrach, 1965; Davis, 1969; Graul, 1975 and 1976; <br />~ Peterson, 1941; Robbins et.al. 1966; U.S. Department of <br />Interior, Bureau of Land Management, 1976; Stearns-Roger, <br />1973; Peabody Coal Company, 1973). <br />Because of their mobility, almost any North American bird <br />species may show up on the site; to make the list meaningful, <br />only those species which are highly likely to be found either <br />on, or in close proximity to, the site were listed. The <br />following section discusses the potential bird populations <br />{by taxonomic order) of the study site, including seasonal <br />occurence, habitat utilization, and status of existing <br />knowledge. ' <br />2.5.2 Anseriformes (Ducks and other waterfowl) <br />The study site has no permanent streams or impoundments <br />to attract waterfowl. Stock ponds are found in both Dowden <br />and Bayden Gulches, two intermittent streams which drain the <br />study site. The small 'size of the impoundments and the <br />trampled vegetation around their margins prevents them from <br />being used by waterfowl for breeding. Green-winged teal are <br />commonly reported in the area in early fall (Hector, 1976) <br />and mallards were seen on several of the stock ponds in <br />Hayden Gulch during the October faunal surveys. <br />2.5.3 Falconiformes (Vultures, hawks, and falcons) <br />Turkey vultures are seasonally present in the Willians <br />Fork Mountains during the sumsaer and are likely to forage <br />in the area of the study site. Since they require caves, <br />dense groves of tall trees, or similar shelter for roosting <br />and nesting, the study site would probably not meet habitat <br />requirements other than feeding. ' <br />Several hawks may utilize the site at least seasonally. <br />Red-tailed hawks were seen on several occasions in the vicinity <br />of the study site. No red-tailed hawk nests were observed <br />on the site, but this species breeds in the area and some of <br />the larger aspen and oaks on the site could provide potential <br />nesting sites. Both Swainson's and rough-legged hawks are <br />recorded in the Williams Fork Mountains during migratory <br />periods; neither hawk breeds in the vicinity of the study <br />site. Small nurwers of rough-legged hawks winter in the <br />Williams Fork Mountains and may forage on the study site <br />during winter. <br /> <br />-42- <br />r.. <br />~: <br />`,~ <br />i <br />r <br />r <br />L <br />r <br />t <br /> <br />r <br />c~ <br />l~ <br />r'~ <br />~-~ <br />.L <br />~~ <br />r"~ <br />r€ <br />~~ <br />~~ <br />r' <br />_~ <br />~~ <br />M <br />