Cassowary or ostrich

• Kiwi or ostrich
• Rhea or ostrich
• Flightless birds having flat breastbones lacking a keel for attachment of flight muscles ostriches
• Rhea or emu
• Kiwi, e.g
• Kiwi or rhea
• Emu or Rhea

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].

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

Wikipedia Word definitions in Wikipedia
A ratite is any of a diverse group of large, flightless birds of the infraclass Palaeognathae . The systematics involved have been in flux. Some sources state that ratites include all the flightless birds of the Palaeognathae; previously, all these birds ...