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

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

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

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

Gabriel Rojo / Greater rhea (Rhea americana) resting on grass, La Pampa , Argentina

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

Roland Seitre / Greater Rhea (Rhea americana) chicks, Argentina, captive.

Roland Seitre / Greater rhea (Rhea americana araneipes) Beni, Bolivia.