Gyrfalcon, Falco rusticolus L.
Bureau of Land Management, U.S. Dept. of the Interior, Denver Service Center, 1974 - Nature - 14 pages
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areas average bar-tailed barred Bengtson birds of prey Breeding projects Brooks Range Brown and Amadon Bureau of Land Cade's study cere color phases creamy tinge dark gray phase dark grayish-brown eggs were laid eyrie fledged Falco rusticolus Gabrielson and Lincoln golden eagles gray phase bird Grossman and Hamlet gyrfalcon eyries Gyrfalcon habitat gyrfalcon population Gyrfalcons fledge Gyrfalcons nesting HABITAT MANAGEMENT heavily streaked hunting Juvenile gray phase L. G. Swartz Land Management large numbers located moustachial stripe National Audubon Society Nesting cliff nesting sites nesting species number of gyrfalcons numbers of ptarmigan pair of gyrfalcons peregrine falcon plain-tailed plumage prey densities prey species protection ptarmigan Lagopus ptarmigan numbers ptarmigan population Raptor Research Foundation RECD Roseneau Seward Peninsula South Dakota species of raptors tail feathers Todd and Friedmann underparts are white University of Alaska Walker White and Cade White and Weeden White phase wildlife wings and tail young gyrfalcons young per eyrie