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Ratite Bird
- flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
- flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
Ratitae
- used in former classifications to include all ratite bird orders
Rheiformes
- a ratite bird order: birds intermediate in characteristics between ostriches and emus: recent and extinct rheas
Rheidae
- a family of birds coextensive with the order Rheiformes
Rhea
- larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia
- smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan
- fertility goddess in ancient Greek mythology; wife of Cronus and mother of Zeus; identified with Roman Ops and Cybele of ancient Asia Minor
Rheas
- larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia
- smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan
- fertility goddess in ancient Greek mythology; wife of Cronus and mother of Zeus; identified with Roman Ops and Cybele of ancient Asia Minor
Rhea Americana
- larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia
Red Siskin
- South American species of scarlet finch with black head and wings and tail
- South American species of scarlet finch with black head and wings and tail
Redpoll
- small siskin-like finch with a red crown and a rosy breast and rump
Redpolls
- small siskin-like finch with a red crown and a rosy breast and rump