The greater rhea is the largest of all South American birds and is related to ostriches and emus. Their large wings are useless for flight but, are used for balance and for changing direction as the bird runs. Unlike most birds, rheas have only three toes. It takes Young rheas just six months to reach adult size. There are three species of rhea: the long-billed rhea and the common rhea, which are both found in Brazil, and the slightly smaller Darwin's rhea, which lives in Argentina and the Andes Mountains
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