The greater rhea (Rhea americana) is a flightless bird found in eastern South America. Other names for the greater rhea include the grey, common, or American rhea; ñandú (Guaraní); or ema (Portuguese). One of two species in the genus Rhea, in the family Rheidae, the greater rhea is endemic to Argentina, Bolivia, Brazil, Paraguay and Uruguay. It inhabits a variety of open areas, such as grasslands, savanna or grassy wetlands.