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

Klein & Hubert / Ostrich (Struthio camelus australis) flock at sunset, South Africa.

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

Klein & Hubert / Male Ostrich (Struthio camelus massaicus) running, Kenya.,

Klein & Hubert / Male Ostrich (Struthio camelus massaicus) running, Kenya.,

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

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

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

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

Mary McDonald / Somali ostrich (Struthio camelus) peering beneath itself, Samburu Game Reserve, Kenya, East Africa

Anup Shah / Maasai ostrich male and female courting (Struthio camelus massaicus) Masai Mara National Reserve, Kenya

Richard Du Toit / Low level view of domestic Ostrich (Struthio camelus), Overberg, Southern Cape, South Africa August

Christophe Courteau / Oryx (Oryx gazella) and Ostriches (Struthio camelus) running, Etosha National Park, Namibia, August 2009

Tony Heald / Ostrich [Struthio camelus] courtship display by female, Etosha National Park, Namibia, August

Tony Heald / Ostrich [Struthio camelus] courtship display by female, Etosha National Park, Namibia, August

Ingo Arndt / Ostrich (Struthio camelus) chick hatching from egg, Africa, captive.

Ingo Arndt / Ostrich (Struthio camelus) chick hatching from egg, Africa, captive.

Ingo Arndt / Ostrich (Struthio camelus) pair courtship display, Masai Mara National Reserve, Kenya, Africa

Solvin Zankl / Ostrich (Struthio camelus) with Sesriem Sossusvlei sand dune in the background, Namib desert, Namibia

Richard Du Toit / Flock of domestic Ostrich {Struthio camelus} Southern Cape, South Africa (This image may be licensed either as rights managed or royalty free.)

Richard Du Toit / Aerial view of Ostrich {Stuthio camelus} running across sand dunes, Namib Naukluft Park, Namibia

Anup Shah / Ostrich pair exhibiting courtship display behaviour (Struthio camelus) Masai Mara NR, Kenya

Jane Burton / Digital composite - Sequence showing an Ostrich {Struthio camelus) hatching.

Luiz Claudio Marigo / Courtship display of Ostrich pair {Struthio camelus} Buffalo Springs NR, Kenya

Anup Shah / Ostrich sticking head in the ground {Struthio camelus} (scratching) Kenya, East Africa

Tony Heald / Ostrich and chicks drinking {Struthio camelus} Etosha NP, Namibia

Tony Heald / Ostrich chicks {Struthio camelus} Etosha NP, Namibia. Giraffe legs and distant warthog.

Anup Shah / Ostrich pair courtship display, Masai Mara, Kenya

Anup Shah / Ostrich yawning, eye shut, beak open {Struthio camelus}, Masai Mara Game Reserve, Kenya

David Tipling / Ostrich {Struthio caamelus} portrait Ostrich farm, UK

Tony Heald / Ostrich male and female courtship behaviour (Struthio camelus) Etosha NP, Namibia

Tony Heald / Two male Ostriches running during dispute, Etosha NP, Namibia. Ostrich can run at speeds of 43mph - they are the fastest terrestrial birds.

Ingo Arndt / Ostrich (Struthio camelus) female chasing away rival, Masai Mara National Reserve, Kenya

Juergen & Christine Sohns / Ostrich (Struthio camelus) mother with chicks, Oudtshoorn, Western Cape, South Africa

Yva Momatiuk & John Eastcott / Ostrich (Struthio camelus) female, Etosha National Park, Namibia

Yva Momatiuk & John Eastcott / Ostrich (Struthio camelus) sub-adults at waterhole in dry season, Etosha National Park, Namibia

Richard Du Toit / Ostrich (Struthio camelus) male in threat display, Rietvlei Nature Reserve, South Africa

Anup Shah / Ostrich (Struthio camelus) family, Masai Mara, Kenya

Gerry Ellis / Ostrich (Struthio camelus), east Africa

Gerry Ellis / Ostrich (Struthio camelus) group in large commercial farm near Kkruldfontein, western South Africa

Gerry Ellis / Ostrich (Struthio camelus) females in large commercial farm, near Kruldfontein, western South Africa

Mitsuaki Iwago / Ostrich (Struthio camelus) male and two females running, Serengeti National Park, Tanzania

Vincent Grafhorst / Ostrich (Struthio camelus) chicks walking on Nossob Riverbed, Nossob River, Kgalagadi Transfrontier Park, Botswana

Vincent Grafhorst / Ostrich (Struthio camelus) pair mating, Khama Rhino Sanctuary, Serowe, Botswana