David Perpinan / Rhea (Rhea americana) incubating eggs, gets up and turns one over, Pantanal, Mato Grosso do Sul, Brazil.

Konrad Wothe,Konrad Wothe / Greater Rhea (Rhea americana) male, Pantanal, Brazil, South America

Luiz Claudio Marigo / Common / Greater rhea {Rhea americana} Cerrado, Emas National Park, Goias, Brazil

Nick Garbutt / Lesser rhea (Rhea pennata) male and chicks in grassland. Torres del Paine National Park, Patagonia, Chile. November.

Nick Garbutt / Darwin's rhea (Pterocnemia pennata) with tower peaks in background. Torres del Paine National Park, Patagonia, Chile. December.

Nick Garbutt / Darwin's rhea (Pterocnemia pennata), two with tower peaks in background. Torres del Paine National Park, Patagonia, Chile. December.

Gabriel Rojo / Greater rhea (Rhea americana) eggs in nest, at edge of arable field. Patagonia, Argentina. October.

Gabriel Rojo / Greater rhea (Rhea americana) nest with many eggs, at edge of arable field. Patagonia, Argentina. October.

Angelo Gandolfi / Greater rhea (Rhea americana), three feeding on agricultural land. Brazil.

Angelo Gandolfi / Greater rhea (Rhea americana), six walking across grassland. Cerrado, Brazil.

Ingo Arndt / Lesser Rhea (Rhea pennata) killed and covered by Puma (Puma concolor), Torres del Paine National Park, Patagonia, Chile

Franco Banfi / Greater rhea (Rhea americana) Pantanal wetlands, Mato Grosso, Brazil