Oriol Alamany / Darwin's rhea (Rhea pennata), Torres del Paine National Park, Patagonia, Chile

Oriol Alamany / Darwin's rhea (Rhea pennata), resting on ground, Torres del Paine National Park, Patagonia, Chile

Oriol Alamany / Darwin's rhea (Rhea pennata), head portrait, Torres del Paine National Park, Patagonia, Chile

Oriol Alamany / Darwin's rhea (Rhea pennata), resting on ground, Torres del Paine National Park, Patagonia, Chile

Patricio Robles Gil / Greater Rhea (Rhea americana) entering water to cross the river. Parana, Southern Brazil.

Oriol Alamany / Darwin's Rhea (Rhea pennata), Torres del Paine National Park, Patagonia, Chile, January

Pete Oxford / Two Common / Greater rhea {Rhea americana} foraging in scrubland, Pantanal, Brazil

Gabriel Rojo / Lesser / Darwin's rhea (Rhea pennata) Monte Leon National Park, Santa Cruz Province, Patagonia, Argentina, December

Staffan Widstrand / Greater rhea {Rhea americana} Iquazu Falls, Argentina

Hanne & Jens Eriksen / Lesser / Darwin's Rhea {Rhea pennata}portrait resting on ground, Torres Del Paine, Chile.

Staffan Widstrand / Common rhea portrait {Rhea americana}

Hermann Brehm / Darwin's / Lesser rhea {Rhea pennata} Torres del Paine NP, Chile

Pete Oxford / Common rhea portrait {Rhea americana} Pantanal, Brazil

Pete Oxford / Common rhea {Rhea americana} Pantanal, Brazil.

Hermann Brehm / Common / Greater rheas {Rhea americana} Pantanal, Brazil

Hermann Brehm / Common / Greater rhea {Rhea americana} Pantanal, Brazil

John Waters / Common rhea male at nest with eggs {Rhea americana} NE Argentina

Peter Bassett / Common rheas, Argentina. Grassland

Staffan Widstrand / Greater Rhea {Rhea americana} Pantanal, Mato Grosso, Brazil.

Daniel Gomez / Darwin's / Lesser rhea grazing on steppe {Rhea pennata} Estancia Chali-Aike, Patagonia, Argentina, South America

Pete Oxford / Common rhea beside termite mound with flowering tree in background, Pantanal, Brazil

Peter Bassett / Common / Greater rhea (Rhea americana) on grassland, Argentina

Gabriel Rojo / Common / greater rhea {Rhea americana} Ibera marshes, Argentina

Pete Oxford / Two Greater rhea foraging in scrub {Rhea americana} Pantanal, Brazil South America

Gabriel Rojo / Common / Greater rhea {Rhea americana} amongst cattle. Ibera marshes, Argentina