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usually remained within a 0.8 km radius of the nest site... Sheep occasionally use the fringe of the .aspen stands where cranes are frequently observed. One rancher in the Hahn's Peak Basin area observed "cranes will not remain in Beaver Creek Park when the sheep are being grazed". The noise and the number of sheep sometimes present in California Park were observed to disturb some of the cranes enough to cause them to move to the next drainage. In 1976 one pair of cranes were never located again after they moved from an area into which sheep had. been moved. In another instance, a group of 11 to 15 cranes which stayed almost exclusively on the open sagebrush ridges in California Park, abandoned this site for a short period of time and moved to a site 0.8 km away when a band of 1,000 sheep moved into the area. The birds returned to the site after the sheep were removed. Cattle appear to have. less effect on crane behavior, and the two species were found feeding quietly together. A pair with one chick fed i.n a meadow for 4 weeks with cattle grazing the same area. The two species often fed within 7 m of each other. Cattle grazing the California Park area after the hatching of the ch"icks have little adverse effect on the cranes..." (pp 198-201). Of the five factors listed by Bieniasz (1979) that threaten the crane population in Routt County, three are applicable to Twentymile Park: (1) haul roads; (2) grazing; and (3) coal development. A sixth factor, grain farming which increases forage for. the. cranes, also increases damage claims du,e to cranes. This could result in pressure to remove cranes from certain areas. STUDY AREA The study area covered about 23 square miles (T6N, R86W, sections 32-34; TSN, R86W, sections 2-11 and 14-23). Elevation ranged from 6642 ft. near fish Creek to 7000 ft. 5