The RHEA is a flightless South American bird, belonging to the family Rheidae. It is native to Argentina, Bolivia, Brazil, Paraguay and Uruguay. It is the largest bird in South America, and is similar in appearance to an ostrich or emu. The RHEA is a herbivore, and feeds mainly on grasses, seeds, fruits and leaves. It is an important part of the local ecosystem, as it helps disperse seeds and other plant material.