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Rheas
Order:
Rheiformes
Family: Rheidae
2 species
Southern South America
largest New World bird spp. (up to 25 kg; 1.5 m tall); flightless but strong maneuverable runners; bill flat, wide; wings short; birds of plains and open foothills; no rectrices; 3 toes; soft filmy grayish plumage;
omnivorous;
polygynandrous; eggs of multiple females incubated by male; 11-18 eggs/female, up to 80/nest; young nidifugous; sexual maturity at 2 years
(Image taken from Harrison, C. and Alan Greensmith. Birds of the world. DK Publishing: New York, 1993.)