Question: are rheas related to ostriches?
Answer: Rhea, either of two species of large, flightless birds in the family Rheidae, order Rheiformes. They are native to South America and are related to the ostrich and emu. ... Both species are considerably smaller than the ostrich; the common rhea stands about 120 cm (4 feet) tall and weighs about 20 kg (50 pounds).