By DickDaniels (http://carolinabirds.org/) (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)
South America. The southern half of the continent from southern Brazil to Tierra del Fuego and including the Falkland Isles. The southern-most breeders move north to southern Brazil in the winter.
Least Concern
NBN atlas has 62 records as at end 2024 with a concentration in East Anglia. Map Here.
Present among a wide range of waterfowl at Regents Park (https://ww2.rspb.org.uk/community/chat/f/2542/t/108859.aspx).