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| larger of two tall fast-running flightless birds similar to ostriches but three-toed; larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia ❲Rhea americana❳ | |||
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| smaller of two tall fast-running flightless birds similar to ostriches but three-toed; smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan ❲Pterocnemia pennata❳ |