$Theristicus branickii Sibley,1995,Birds of the World,version 1.5
"Laying...September-December in S Chile and Tierra del Fuego." (HBW,1,p.499)
Southern populations in Chile and Argentina migrate to the papas of in northern Argentina.In Tierra del Fuego it is a breeding summer visitor;spring migration starts in late August and autumn migration starts in late January, with most birds leaving by the end of April.Very few records of birds over-wintering in the area. Irregular vagrant to Falkland Islands,in parties of up to 7 birds.