Found in eastern and central Brazil, Paraguay, Uruguay, Bolivia, and Central Argentina.
Adult birds stand about 5 feet tall and weigh between 60 and 70 pounds. The male is the larger of the two sexes. These birds are extremely hardy and will stay out in the most horrid UK weather, all night without problem. They seem as hardy as sheep!
Rheas are polygamous-polyandrous, which means that the roles of the males and females are reversed, the male builds the nest, incubates the eggs and rears the chicks once they are hatched, the female’s only role is to lay the eggs. When spring arrives, the males become aggressive towards one another and strut around with the feathers on their heads, necks, and chests raised so that they appear larger than they really are. These birds when over 8 months old will not be bothered by foxes.