have high mortality in typical confinement farming situations, but under optimum free-range conditions chicks will reach adult size by their fifth month. References Further reading External links Rheas Rhea videos, photos and sounds on the Internet Bird Collection greater rhea Domesticated birds Birds of South America Birds of Argentina Birds of Bolivia Birds of Brazil Birds of Paraguay Birds of Uruguay greater rhea greater rhea ja:レア (鳥類)#アメリカ・レア