Pictures of Greater Rheas (Rhea americana).
The Rhea is a large, flightless bird with gray-brown plumage, long legs, and a long neck similar to an ostrich. It can reach 5.5 feet tall and weigh up to 88 pounds. Rheas prefer to eat broad-leafed plants, but they can also eat seeds, roots, fruits, lizards, beetles, and dead animals (carrion).
During the non-breeding season, rheas may form flocks of up to 100 birds. The males sit on the nests and care for the chicks. Rhea males build nests that hold up to 60 eggs from multiple females.
When they run, they spread their wings to act like sails.