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Definitions:
Noun
rhea
nandu
Pterocnemia pennata
Definition: smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan
Definition: Any of the rheas: the large, flightless birds of the three species of South American ratites of the genus Rhea (Brisson, 1760), which is also known by its junior synonym Pterocnemia (Gray, 1871).