The Greater Rhea, scientifically known as Rhea americana, is also named among the flightless birds. It is found in eastern South America. It has other names which include the Grey, Common, American Rhea, ñandú (Guarani) or ema (Portuguese). The Greater Rhea happens to be one of two species in the genus Rhea, and is in the family Rheidae. This bird is endemic to Argentina, Bolivia, Brazil, Paraguay, and Uruguay. It is found to inhabit a variety of open areas, such as grasslands, savanna or grassy wetlands. The Greater Rhea measures 3–5 feet (0.91–1.5 m) in length, and has a wingspan of 5 feet (1.5 m). Its weight ranges from 50–55 pounds (23–25 kg), and it happens to be the largest bird in South America. It has a life expectancy of 15 years in the wild. An interesting point to note is the fact that a group has established itself in recent years in Germany.
This bird loves to live on the pampas, and woodlands in the south-eastern part of South America. Though they live in the grasslands, they try as much as possible to avoid open places. They rather prefer areas with some tall vegetation, near swamps or rivers.
The Greater Rhea has its breeding season from August to January. It is quite interesting to know that the male rhea courts two to twelve females. A nest formed from a shallow hole in the ground is usually built by the male. The nest is surrounded by twigs and other vegetation. It so happens that each of the females courted lays one egg in his nest at intervals about two days apart. The female then moves off to the next male to have some more eggs laid. The male does well to stay close to the nest until the total number of eggs falls within the range 10-60. The male also takes care of incubation which lasts for about six weeks. After the chicks hatch, the male does well to take care of them until they are 6 months old. It takes 2- 3 years for the young rhea to reach sexual maturity.