Theristicus caudatus Upland Goose Chloephaga picta Austral Thrush Turdus falcklandii Black-chested Buzzard-Eagle Geranoaetus melanoleucus The Austral Thrush , Turdus falcklandii , is a medium sized thrush from southern South America . There are two subspecies , the Magellan Thrush ( T. f. magellanicus ) from south Argentina and south and central