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| | Struthioniformes Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-08) |
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 | | All extant species belong to the order Struthioniformes; some extinct species belong to Struthioniformes, while some belong to Aepyornithiformes. |
 | | Unlike other flightless birds, the ratites have no keel on their sternum and, lacking a strong anchor for their wing muscles, could not fly even were they to develop suitable wings. |
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