Sylvain Cordier / Greater Rhea (Rhea americana) chicks, Torres del Paine National Park, Patagonia, Chile.

Hermann Brehm / Greater Rhea (Rhea americana) profile, Pantanal, Brazil

Gabriel Rojo / Common rhea, (Rhea americana) head portrait, La Pampa, Argentina

Christof Wermter/ BIA / Greater Rhea (Rhea americana) chick, native to South America

Bernard Castelein / Greater Rhea (Rhea Americana) walking, St Cruz le la Sierra, Bolivia

Sylvain Cordier / Greater rhea (Rhea americana) two birds fighting, Punta Norte, Peninsula Valdes, Argentina

Sylvain Cordier / Greater rhea (Rhea americana) fight between two birds, Punta Norte, Peninsula Valdes, Argentina.

Barrie Britton / Greater rhea (Rhea americana), Fazenda Baia das Pedras, Pantanal, Brazil. Taken on location for BBC Wild Brazil series.

Gabriel Rojo / Greater rhea eggs (Rhea americana) La Pampa , Argentina

Nate Chappell/ BIA / Greater Rhea (Rhea americana), Corrientes, Argentina

Luciano Candisani / Greater Rhea (Rhea americana) portrait, Pantanal, Brazil

Suzi Eszterhas / Greater rhea (Rhea americana) walking through Pantanal, Brazil.