The RHEA is a large flightless bird native to South America, and is the closest living relative of the Ostrich. It is the largest bird in the Americas, and is similar in appearance to the Ostrich, but smaller in size. The RHEA is a fast runner and can reach speeds of up to 43 mph. It is also an excellent swimmer and can dive underwater to feed on aquatic plants. The RHEA is an omnivore, eating both plants and small animals. It is a social bird, living in groups of up to 30 individuals.