Rank MethodExpertise without calculation
Review Date2016-04-09
Change Date1996-11-25
Range Extent>2,500,000 square km (greater than 1,000,000 square miles)
Range Extent CommentsBREEDING: locally in south-coastal Alaska, probably western Alaska, Mackenzie, northwestern British Columbia, around Hudson Bay. NON-BREEDING: in South America on the coast of Chile and from Paraguay, southern Brazil, and Uruguay south to Tierra del Fuego and Falkland Islands (AOU 1983). The most important areas are in Tierra del Fuego: Bahia San Sebastian, Argentina, on Atlantic coast of Tierra del Fuego; Bahia Lomas, at eastern mouth of Strait of Magellan; and Chiloe area of Pacific coast of Chile (Morrison and Ross 1989). MIGRATION: in spring, in North America from Texas and Louisiana north to Alberta, Saskatchewan, and the west side of Hudson Bay; rarely on Pacific Coast of Guatemala and Costa Rica. In fall, southeastward from James Bay to Maritimes and New England, then over water to wintering grounds (AOU 1983).