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• species which could occur in the vicinity of the Danforth Hills study area <br />was compiled on the basis of the Colorado Latilong study (Kingery and Graul <br />1978). <br />3.5 THREATENED AND ENDANGERED SPECIES <br />The regional status and site-specific likelihood for the occurrence of <br />threatened/endangered species was addressed based upon historical records <br />reported in the literature and field surveys. Habitat suitability for the <br />bald eagle (Haliaeetus leucocephalus), peregrine falcon (Falco peregrinus), <br />greater sandhill crane (Grus canadensis), whooping crane (Grus americans), <br />and black-footed ferret (Mustella nigripes) was assessed based on the <br />presence/absence of key habitat requirements (CDOW 1978) as determined <br />during ground and aerial surveys. The status and potential for occurrence <br />of aquatic threatened or endangered species within the study area was also <br />assessed based on existing information concerning their regional status and <br />habitat requirements. <br />• 3.6 RAPTORS AND MIGRATORY BIRDS OF HIGH FEDERAL INTEREST <br />Prior to initiation of field studies during Spring 1984, literature <br />pertaining to the regional distribution of raptors and migratory birds of <br />high federal interest was reviewed. Key sources of information included <br />the Colorado Latilong Study (Kingery and Graul 1978), the Green River-Hams <br />Fork EIS (BLM 19831, and data on file with the USFWS Grand Junction field <br />office. <br />On May 2, 1984, an intensive aerial search of the Danforth Hills study area <br />was conducted using a Hughes 500-D helicopter manned by a pilot and three <br />observers. Locations of raptor nests identified during this survey were <br />plotted on 7.5-minute topographic quadrangles. Notes describing the <br />condition of nests (active, tended, and inactive) and when possible, the <br />species (or family) of raptor responsible for construction of each nest <br />were recorded. Helicopter failure necessitated termination of the 14ay 2 <br />• survey when approximately two-thirds of the study area had been searched. <br />This survey was completed on May 10, 1984, using a Bell Long Ranger <br />3-7 <br />