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• Wildlife Refuge, southeast Idaho. This is an ongoing program at Gray's <br />Lake and the USFWS placed approximately 20 whooping crane egges in <br />sandhill crane nests in the spring of 1979; 6 have survived to date <br />(personal communication, 1979, Mr. Philip Lehenbauer, USFWS). Since some <br />of the whooping cranes raised in this experimental program have remained <br />associated with their foster parents, suitable habitat within the range of <br />greater sandhill cranes must also be considered potential whooping crane <br />summer habitat. Although no greater sandhill crane habitat exists on the <br />Seneca II study area, the Yampa River Valley about six miles north of the <br />study area may be used for migration and staging by greater sandhill <br />cranes (Dow, 1978). However, to date, no whooping cranes have been <br />reported with greater sandhill cranes in this area of Colorado. <br />The principal habitat of black-footed ferrets is prairie dog colonies <br />(Henderson et al., 1974). Based on the lack of principal habitat, there <br />is no indication that black-footed ferrets inhabit the Seneca II project <br />area. <br />• The gray wolf formerly occurred over much of the United States. Due to <br />widespread habitat destruction and human harassment, it now occurs only in <br />small parts of the original range and does not occur on the Seneca II <br />study area. <br /> <br />