Darwin's Rhea, also called the Lesser Rhea, is a little browner and smaller than its better-known Greater cousin.
The nominal subspecies shown comes from Patagonia (southern Argentina and Chile), 1-2 other subspecies come(s) from the Andean Plateau (north Chile/Bolivia).
Like the Greater Rhea, the males incubate and raise the young of multiple mates.
Like Greater Rheas, they are flightless but use their wings for fast change of direction when running at up to 60 km/h
Rear of the Rhea
His nest is a scrape in the ground where females might lay up to 50 eggs for him to defend and incubate (typically far fewer);
he will raise the young alone while the females will go off to mate and lay elsewhere.
(Ironically the bird is named after the Greek Titan Rhea who was mother of the Olympian gods, possibly since it was thought the bird diligently caring for so many chicks was a female.)