ratites >> /ˈratʌɪt/
Definition: [noun] Any of the mostly large, flightless birds with a ratite breastbone, i.e. the ostrich, rhea, emu, cassowary, and kiwi, together with the extinct moa and elephant bird.
Example: Other ratites, the elephant bird of Madagascar and the moas of New Zealand, have been extinct for several centuries, probably as a result of human hunting.
Definition: [adjective] (of a bird) having a flat breastbone without a keel, and so unable to fly.
Example: When the ratite birds first roamed Gondwana, they could walk from any of the places where they later dwelt, to any other.