1) Flightless bird 2) Pterocnemia pennata 3) Ratite 4) Ratite bird 5) Rhea 6) South American ostrich 
• (n.) Any one of three species of South American ostriches of the genera Rhea and Pterocnemia. See Rhea. • (n.) Any one of three species of South American ostriches of the genera Rhea and Pterocnemia. See Rhea.
Pterocnemia pennata noun smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan