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The common ostrich shares the order Struthioniformes with the kiwis, emus, rheas, and cassowaries.
However, phylogenetic studies have shown that it is the sister group to all other members of Palaeognathae and thus the flighted tinamous are the sister group to the extinct moa.
The wings also function as stabilizers to give better maneuverability when running.
Tests have shown that the wings are actively involved in rapid braking, turning and zigzag maneuvers.
If cornered, it can attack with a kick of its powerful legs.
Mating patterns differ by geographical region, but territorial males fight for a harem of two to seven females.
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The common ostrich is the largest living species of bird and lays the largest eggs of any living bird (extinct elephant birds of Madagascar and the giant moa of New Zealand laid larger eggs).
The common ostrich's diet consists mainly of plant matter, though it also eats invertebrates. When threatened, the ostrich will either hide itself by lying flat against the ground, or run away.
They also have unique pubic bones that are fused to hold their gut.
Unlike most birds, the males have a copulatory organ, which is retractable and 20 cm (8 in) long.