Habitat
Inland wetlands, including marshes, swamps, bogs, fens and peatlands. Also freshwater lakes, saltmarshes and coastal inshore waters. From sea-level to 2,500 m.
Anguilla, Antigua And Barbuda, Argentina, Aruba, Bahamas, Barbados, Bolivia, Brazil, Cayman Islands, Chile, Colombia, Cuba, Dominica, Dominican Republic, Ecuador, Falkland Islands (Malvinas), French Guiana, Guadeloupe, Guyana, Haiti, Martinique, Montserrat, Netherlands Antilles, Paraguay, Peru, Puerto Rico, South Georgia and the South Sandwich Islands, St Kitts And Nevis, St Lucia, St Vincent and The Grenadines, Suriname, Trinidad and Tobago, Turks and Caicos Islands, Uruguay (B) (NB), USA, Venezuela, Virgin Islands (British) (B) (NB), Virgin Islands (U.S.) (B) (NB).
Vagrant to Jamaica, Panama.
Population
Estimated population is 180,000 - 1,100,000 (2010).