Rhea or ostrich

• The kiwi is the smallest one
• Kiwis
• Rhea or emu
• Kiwi, e.g
• Rhea, e.g.
• Cassowary, for one
• Emus

WordNet Word definitions in WordNet
n. flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds [syn: ratite bird , flightless bird ] [ant: carinate ]

Wiktionary Word definitions in Wiktionary
n. A bird of the order of Struthioniformes, a diverse group of large running, flightless birds, mostly extinct, but including the cassowary, elephant bird, emu, kiwi, moa, ostrich, rhea and tinamou

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ratite \Rat"ite\ (r[a^]t"[imac]t), a. (Zo["o]l.) Of or pertaining to the Ratit[ae]. -- n. One of the Ratit[ae].