The Ostrich (Struthio camelus) is a large flightless bird native to Africa (and formerly the Middle East). It is the only living species of its family, Struthionidae, and its genus, Struthio. Ostriches share the order Struthioniformes with the Emu, kiwis, and other ratites. It is distinctive in its appearance, with a long neck and legs and the ability to run at speeds of about 74 km/h (46 mph), the top land speed of any bird. The Ostrich is the largest living species of bird and lays the largest egg of any bird species.

The diet of the Ostrich mainly consists of plant matter, though it eats insects. It lives in nomadic groups which contain between five and 50 birds. When threatened, the Ostrich will either hide itself by lying flat against the ground, or will run away. If cornered, it can cause injury and death with a kick from its powerful legs. Mating patterns differ by geographical region, but territorial males fight for a harem of two to seven females.

The Ostrich is farmed around the world, particularly for its feathers, which are decorative and are also used for feather dusters. Its skin is used for leather and its meat marketed commercially.

Taxonomy

The Ostrich was originally described by Linnaeus in his 18th-century work, Systema Naturae under its current binomial name. Its scientific name is derived from the Greek words for "camel sparrow" alluding to its long neck.

The Ostrich belongs to the Struthioniformes order of (ratites). Other members include rheas, Emu, cassowaries and the largest bird ever, the now-extinct Elephant Bird (Aepyornis). However, the classification of the ratites as a single order has always been questioned, with the alternative classification restricting the Struthioniformes to the ostrich lineage and elevating the other groups. Presently, molecular evidence is equivocalFact: date=February 2007 while paleobiogeographical and paleontological considerations are slightly in favor of the multi-order arrangement.

Subspecies

Five subspecies are recognized:

• S. c. australis in Southern Africa, called the Southern Ostrich. It is found south of the Zambezi and Cunene rivers. It was once farmed for its feathers in the Little Karoo area of Cape Province.
• S. c. camelus in North Africa, sometimes called the North African Ostrich or Red-necked Ostrich. It is the most widespread subspecies, ranging from Ethiopia and Sudan in the east throughout the Sahel to Senegal and Mauritania in the west, and at least in earlier times north to Egypt and southern Morocco, respectively. It is the largest subspecies, at 2.74 m (9 ft) 154 kilograms (340 lb). The neck is red, the plumage of males is black and white, and the plumage of females is grey.
• S. c. massaicus in East Africa, sometimes called the Masai Ostrich. It has some small feathers on its head, and its neck and thighs are bright orange. During the mating season, the male's neck and thighs become brighter. Their range is essentially limited to most of Kenya and Tanzania and Ethiopia and parts of Southern Somalia.
• S. c. syriacus in the Middle East, sometimes called the Arabian Ostrich or Middle Eastern Ostrich, was a subspecies formerly very common in the Arabian Peninsula, Syria, and Iraq; it became extinct around 1966.
• S. c. molybdophanes in Somalia, Ethiopia, and northern Kenya, is called the Somali Ostrich. The neck and thighs are grey-blue, and during the mating season, the male's neck and thighs become bright blue. The females are more brown than those of other subspecies. It generally lives in pairs or alone, rather than in flocks. Its range overlaps with S. c. massaicus in northeastern Kenya.