Ratite

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Ratites
Various ratite birds
Various ratite birds
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Superorder: Paleognathae
Order: Struthioniformes*
Latham, 1790
Families

Struthionidae (ostriches)
Rheidae (rheas)
Casuariidae (emus etc.)
Aepyornithidae (elephant birds)
Dinornithidae (moa)
Apterygidae (kiwis)

A ratite is a large, flightless bird, most of which are now extinct. Unlike other flightless birds, the ratites have no keel on their sternum.