The greater rhea, Rhea americana, is a flightless bird found in South America. The greater rhea is also known as grey, common rhea, or the American rhea. The species, first described by Carl Linnaeus in 1758, is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay.
- "Rhea americana". IUCN Red List of Threatened Species. Version 2011.1. International Union for Conservation of Nature. 2008. Retrieved July 25, 2011. Cite has empty unknown parameter:
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- Blake, Emmet Reid (1977). Manual of Neotropical Birds: Spheniscidae (penguins) to Laridae (gulls and allies). University of Chicago Press. pp. 8–9. ISBN 0226056414.
- "Greater Rhea". National Geographic. Retrieved July 26, 2011.