flightless bird, ratite, ratite bird - flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds

Dinornithidae, family Dinornithidae - moas

Dinornis giganteus, giant moa - the largest moa; about 12 feet high

anomalopteryx, Anomalopteryx oweni - the smallest moa; slender moa about the size of a large turkey