Rheas (/ ˈriːəz / REE-əz), also known as ñandus[a] (/ njænˈduːz / nyan-DOOZ) or South American ostrich, [3][4] are South American ratites (flightless birds without a keel on their sternum bone) of the order Rheiformes.

Everything you should know about the Rhea. The Rhea is a tall, flightless bird, native to South America, and is related to the ostrich and emu.

The greater rhea (Rhea americana) is a species of flightless bird native to eastern South America. Other names for the greater rhea include the grey, common, or American rhea; ema (Portuguese); or ñandú (Guaraní and Spanish).

2025年4月5日 · 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. The common rhea (Rhea americana) is found in open country from northeastern Brazil southward to Argentina, while Darwin’s rhea.

Greater rhea are the largest native bird to South America. These graceful giants can stand up to 5.9 feet (1.8 meters) tall and weigh up to 88 pounds (40 kilograms). While they can have a similar mass to the lesser rhea, they often appear larger and are taller due to longer legs, and neck.

Darwin's rhea or the lesser rhea (Rhea pennata) is a large flightless bird, the smaller of the two extant species of rheas. It is found in the Altiplano and Patagonia in South America. The lesser rhea stands at 90 to 100 cm (35–39 in) tall.

As the largest bird in South America, the flightless greater rhea stands at about 4 feet tall. These large South American birds roam the open pampas and sparse woodlands of Argentina and...