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|Noun||1.||flightless bird - flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds|
bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings
Struthio camelus, ostrich - fast-running African flightless bird with two-toed feet; largest living bird
cassowary - large black flightless bird of Australia and New Guinea having a horny head crest
Dromaius novaehollandiae, Emu novaehollandiae, emu - large Australian flightless bird similar to the ostrich but smaller
apteryx, kiwi - nocturnal flightless bird of New Zealand having a long neck and stout legs; only surviving representative of the order Apterygiformes
Rhea americana, rhea - larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia
nandu, Pterocnemia pennata, rhea - smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan
moa - extinct flightless bird of New Zealand
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