Sandhill crane study in the central flyway
U.S. Dept. of the Interior, Fish and Wildlife Service, Bureau of Sport Fisheries and Wildlife, 1967 - Bird populations - 17 pages
Fall-migrating sandhill cranes arrived at congregation sites in southern Canada and in the States of the Central Flyway between late July and early October. Sandhills peaked at about 100,000 birds at way stations during the fall of 1964. Footprint measurements indicated that the lesser sandhill was by far the most numerous subspecies at way stations in Montana, North Dakota, South Dakota, and Colorado. These measurements also indicated that flocks stopping over in Wyoming, Kansas, and Oklahoma contained a significant number of Canadian sandhill or greater sandhill or both. A selective collecting program indicated that the footprint measurement technique overemphasized the incidence of the greater sandhill at way stations in North Dakota and South Dakota. Whooping cranes and sandhills were occassionally observed together during the early part of the fall migration. At times, fall-migrating sandhills fed on standing and harvested grain crops in Canada and hte States of the Central Flyway, but seldom were depredations considered serious.
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Alfalfa County Arkansas Valley Big Grass Marsh birds collected Boeker Bosque del Apache Canada Canadian race Canadian sandhills Central Flyway cluded Colorado congregation sites crop depredations depredations by cranes depredations by sandhill eastern New Mexico fall congregation fall migration fall-migrating sandhills fall-migrating whooping cranes Flyway Waterfowl Council Goshen County greater race greater sandhill crane Gruidae harvest hunting seasons Kans Kansas Kidder and Stutsman Kidder County Last Mountain Lake lesser race lesser sandhill crane limited seasons Manitoba McLean County Medicine Lake ments Mexico and Texas mid-September midtoe migrating whooping cranes Mobridge-Pollock area Montana National Wildlife Refuge North Dakota North Dakota—September Oklahoma Prewitt Reservoir racial composition represent the greater Salt Plains NWR Salt Plains Refuge San Luis Valley sandhill crane congregation sandhill crane hunting sandhill crane season Saskatchewan selective collecting September South stations Stutsman Counties subspecies T. D. Burleigh Track measurements Unconfirmed Verified vicinity Washita National Wildlife Williston Wyoming