The ostrich or common ostrich is either one or two species of large flightless birds native to Africa, the only living member of the genus Struthio, which is in the ratite family. Some analyses indicate that the Somali ostrich may be better considered a full species separate from the Common Ostrich, but most taxonomists consider it to be a subspecies. The ostrich shares the order Struthioniformes with the kiwis, emus, rheas, and cassowaries. However, phylogenetic studies have shown that it is the basal extant member of Palaeognathae and is thus equally closely related to flighted tinamous. Source
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