ratite

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Related to Struthioniformes: ostrich

ratite

any flightless bird that lacks a keel on the sternum, for example, ostrich, rhea or emu.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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The husbandry and medical records and necropsy reports of 1002 captive Struthioniformes that died at the Reserve Africaine de Sigean (France) from 1974 to 2015 were examined.
They include Struthioniformes, Falconiformes, and Sphenisciformes [27].
In the present study we studied the anatomical and histological details of the pecten oculi in the ostrich (Struthioniformes), duck (Anseriformes), pigeon (Columbiformes), turkey (Galliformes), and starling (Passeriformes) which belong to different orders of the avian species.