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A common misconception is that Ostriches are birds. They are not. They are unlike any bird species in form and function.
Ostriches, along with Emu and Rhea, are all members of the Ratite family. All three are farmed for their meat as food. Most of these avian species are flightless with very small (vestigial) wings. However they possess extremely strong and large legs for supporting their large body weight and enhanced mobility.
https://en.wikipedia.org/wiki/Ratite#Living_forms
The African ostrich is the largest living ratite. A large member of this species can be nearly 2.8 metres (9.2 ft) tall, weigh as much as 156 kilograms (344 lb),[15] and can outrun a horse.
Some Ostrich species have been used for racing as a sport with smaller-size human jockeys.
Of the living Ratite species, the Australian emu is next in height, reaching up to 1.9 metres (6.2 ft) tall and about 50 kilograms (110 lb).[15] Like the ostrich, it is a fast-running, powerful bird of the open plains and woodlands.
The third largest member of the Ratite family is the Rhea. The greater rhea is endemic to open grasslands (Pampas) and Savannah areas in Argentina, Bolivia, Brazil, Paraguay and Uruguay. South America has two species of rhea, large fast-running birds of the Pampas. The larger American rhea grows to about 1.4 metres (4.6 ft) tall and usually weighs 15 to 40 kilograms (33–88 lb).[15]
African Ostrich
Ostrich Egg
Australian Emu
Egg of an Emu
South American Rhea
Three ratite eggs compared