This is the largest bird in South America. It can be found in open grasslands, pampas and woodlands in the southern region of the continent. Its number in the wild is decreasing due to habitat loss, but it is still not listed as endangered species.

It can reach 5 feet in height and weigh up to 55 pounds. Its body is covered with grey-brown plumage with dark patches on the neck and back. The abdomen and thighs are covered with white feathers.

It has strong legs with three toes that are designed for running, but it is a flightless bird because it lacks the breast bone which connects muscles required for flying. Although it is unable to fly, it can reach the speed of up to 40 miles per hour its large wings provide stability during running.

It feeds on both meat and plants, its normal diet may include seeds, fruits, roots, plants, lizards, insects, reptiles.

Rheas are polygamous animals, A male can mate with between two and twelve females. He will build a nest where each female will deposit her eggs. The number of eggs can vary from 12 to 50, depending on the number of mating partners. The male keeps the eggs warm throughout the incubation period that lasts 6 weeks and looks after the chicks after hatching, keeping both female rheas and predators away.

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