Rheiformes |
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| Ostrich, American; Rhea; Rhea americana; American Ostrich; American Ostriches; American Ostrichs; Ostrichs, American | |
| An order of large, long-necked, long-legged, flightless birds, found in South America. Known as rheas, they are sometimes called American ostriches, though they are in a separate order from true OSTRICHES. | |