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The tarsus of the common ostrich is the largest of any living bird, measuring 39 to 53 cm (15 to 21 in) in length.
The common ostrich belongs to the ratite order Struthioniformes.
Their temperature control relies in part on behavioural thermoregulation.
For example, they use their wings to cover the naked skin of the upper legs and flanks to conserve heat, or leave these areas bare to release heat.
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.