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accessible habitat acres aircraft Alberta Alcidae Amer Atlantic Puffin barren-ground caribou Black Guillemot Black-legged Kittiwake Bossenmaier and Marshall breeding birds breeding cycle Canadian prairies Canadian Wildlife Service Census techniques chicks colony or sub-area Conf control areas cost Counts of birds Counts of burrows Counts of nests damage areas Describe each colony detailed sketch map direct counts Distribution maps dommages duck damage estimate farmers feeding stations field Gollop grain gulls Hammond harvest Hochbaum inaccessible Laridae Last Mountain Lake ledges Line transect lure crops main physical features Manitoba map to scale Mark locations method nest density nesting habitat Nettleship number of birds number of breeding number of nests number of pairs Peace-Athabasca Delta Photograph each colony population programs Razorbill record reliable RRCS sandhill cranes Saskatchewan seabirds select one category species Stephen survey swathed tion total nesting area total number Trans transect lines Typescript U.S. Dept waterfowl damage Wildl