The winter range of North American breeding birds of this species is more or less imperfectly known, and they are believed to winter largely at sea. It has been reported as wintering in southern California; it has been taken or observed in Costa Rica (Desamparados) and Peru (Tumbez); there is a specimen in the museum at Buenos Aires, Argentina, that was taken in Patagonia. _Spring migration._--Early dates of arrival in North America are: Florida, 175 miles west of Tampa, March 14; Bermuda Islands, March 18; South Carolina, near Chester, May 17; North Carolina, Cape Lookout, April 3; Maryland, Cumberland, May 23; New Jersey, 80 miles off Barnegat, May 6, and Cape May County, May 22; New York, Long Cave, April 2, Montauk Point, April 30, and Branchport, May 16; Connecticut, Quinnipiac Marshes, May 21; Massachusetts, near Boston, May 5, Marthas Vineyard, May 6, and Provincetown, May 21; Maine, near Milo, May 3; Quebec, Godbout, May 27; Nova Scotia, Halifax, May 12; Ohio, Youngstown, May 26; Nebraska, Lincoln, May 10; Manitoba, Shoal Lake, May 19; Saskatchewan, Indian Head, May 15, Osler, May 13, and Dinsmore, May 30; Colorado, Loveland, May 1, Denver, May 17, and Middle Park, May 26; Montana, Big Sandy, May 18, and Terry, May 21; Alberta, Beaverhill Lake, May 7; California, Monterey, April 9, Santa Barbara, April 24, Fresno, May 5, Los Banos, May 19, and Santa Cruz, May 22; Oregon, Klamath Falls, April 17, Malheur Lake, April 26, and Newport, April 30; Washington, Destruction Island Lighthouse, April 27, Shoalwater Bay, May 9, and Olympia, May 13; British Columbia, Okanagan Landing, May 18, and Mabel Lake, May 25; Yukon, Forty-mile, May 3; Alaska, Fort Kenia, May 3, Bethel, May 19, Kowak River, May 22, Igushik, May 23, St. Michael, May 14, Fort Yukon, June 1, and Point Barrow, June 11; and Greenland, North Star Bay, June 14.