1. Long, strong legs: Rheas have long, powerful legs that enable them to run at great speeds. They are capable of reaching speeds of up to 60 km/h (37 mph). These legs also aid rheas in defending themselves against predators.
2. Three-toed feet: Rheas have three-toed feet that provide stability and traction while running. The nails on their toes are sharp and can be used as weapons against predators.
3. Flexible neck: Rheas have a long, flexible neck that they use to scan their surroundings for food and predators, and to reach vegetation on the ground.
4. Keen eyesight: Rheas have keen eyesight that allows them to spot potential threats from a distance. Their eyes are positioned on the sides of their head, providing them with a wide field of vision.
5. Brownish-gray feathers: The common rhea's plumage is brownish-gray in color, blending in with the surrounding environment and providing camouflage from predators.
6. Social behavior: Rheas live in groups called flocks, which offer protection and facilitate communication.
These adaptations, combined with their impressive running speed and the ability to use their legs as a defensive tool, aid rheas in surviving and thriving in their natural habitats in South America.