Ann & Steve Toon / Ostrich (Struthio camelus) silhouetted in dust storm. Kalahari Gemsbok National Park, Kgalagadi Transfrontier National Park, Northern Cape, South Africa. Commended in the Bird Photographer of the Year...

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

Christophe Courteau / Ostriches (Struthio camelus) running in the distance in a mirage, Sossusvlei, Namib-Nauckluft National Park, Namib Desert, Namibia.

Ann & Steve Toon / Ostrich (Struthio camelus) male standing in landscape, Table Mountain National Park, Western Cape, South Africa

Hougaard Malan / Ostrich (Struthio camelus) pair and chicks on dune in the Kalahari. Kgalagadi Transfrontier Park, Southern Africa, February.

Eric Baccega / Male Ostrich (Struthio camelus) protecting chicks from the sun with its wings, Samburu National Reserve, Kenya, Africa.

Denis-Huot,Denis-Huot / Ostrich (Struthio camelus) female and male with chicks, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Ostrich (Struthio camelus) female portrait, Masai-Mara Game Reserve, Kenya

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

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.

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