Rhea Facts For Kids (South America's Giant Birds)

What bird stands almost as tall as a person, runs faster than most animals, and has a father that does ALL the parenting? The rhea! These large, flightless birds are South America's answer to the ostrich and emu. Rheas roam the grasslands and scrublands of Argentina, Brazil, and other South American countries. They look a lot like smaller ostriches, with long necks, powerful legs, and fluffy feathers. There are two species—the greater rhea and the smaller Darwin's rhea. Let's learn about these incredible running birds!

What Do Rheas Look Like?

Rheas are the largest birds in South America! Greater rheas stand about 5 feet tall and weigh up to 88 pounds. Darwin's rheas are smaller, about 3 feet tall and 30 pounds. Both species have long necks, small heads, and large bodies covered in loose, fluffy feathers. Their feathers drape over their bodies like a shaggy cloak. Rheas are gray-brown with white bellies!

Rheas look like smaller versions of ostriches but have some key differences! Rheas have three toes on each foot, while ostriches have only two. Rhea feathers are softer and fluffier than ostrich feathers. Rheas also have larger wings compared to their body size. They spread these wings like sails while running to help them balance and steer around obstacles!

Rheas have strong, muscular legs designed for running! Their thighs are thick and powerful. Their long legs give them a huge stride that covers ground quickly. Rheas also have sharp claws on their toes that they use for defense. A kick from a rhea can be dangerous! Male rheas are usually larger than females and may have darker feathers on their necks!

Where Do Rheas Live?

Rheas live in South America! Greater rheas are found in the grasslands, pampas, and savannas of Argentina, Brazil, Uruguay, Paraguay, and Bolivia. Darwin's rheas live in the high-altitude grasslands of the Andes Mountains and the windswept plains of Patagonia at the southern tip of South America. Both species prefer wide-open areas where they can see predators coming!

Rheas like flat, open habitats with some bushes and tall grass! They avoid dense forests where their large size would make moving difficult. Greater rheas are often seen in farm fields and ranches. They sometimes cause problems by eating crops. Darwin's rheas live at elevations up to 15,000 feet in the Andes—some of the harshest mountain grasslands on Earth!

Rheas are social birds that live in flocks! Outside of breeding season, rheas gather in groups of 10 to 100 birds. Mixed flocks may include both males and females of all ages. Large flocks provide safety because more eyes watch for predators. When breeding season arrives, the flocks break up as males compete for females!

What Do Rheas Eat?

Rheas are omnivores that eat plants and small animals! Their diet includes grasses, seeds, roots, fruits, and flowers. They also eat insects, lizards, frogs, and small birds when they can catch them. Rheas are not picky—they'll eat whatever food is available in their grassland habitat. They forage by walking slowly and pecking at the ground!

Rheas swallow small stones called gastroliths to help digest food! Since they don't have teeth, the stones in their stomach grind up tough plant material. These stomach stones work like a food processor. Rheas also eat charcoal from burned grasslands! Scientists think the charcoal may help absorb toxins from plants they eat!

Rheas need to drink water regularly! Unlike some desert birds, rheas can't go long without water. They stay near rivers, lakes, and ponds. Rheas drink by dipping their bills and tipping their heads back. They also get moisture from the plants and insects they eat. During dry seasons, rhea flocks gather near remaining water sources!

Cool Facts About Rheas

• Super dads: Rhea fathers do ALL the parenting! After mating, the male builds the nest, sits on the eggs, and raises the chicks entirely by himself. The father sits on 10 to 60 eggs from several different females. He doesn't eat for the entire 6-week incubation period. After hatching, he protects and guides the chicks for up to 6 months. Rhea dads are some of the best fathers in the bird world!
• Speed runners: Rheas can run up to 40 miles per hour! Their powerful legs and long stride make them one of the fastest birds on land. When running, rheas spread one wing higher than the other to help them turn sharply. They zigzag and dodge when chased, making it very hard for predators to catch them. Their running style looks like a feathered ballerina sprinting!
• Wing sails: Even though they can't fly, rheas use their wings! When running at full speed, they spread their wings like sails to catch the wind. This helps them balance and change direction quickly. They also raise their wings to cool down on hot days. During courtship, males dance with their wings spread wide, running back and forth to impress females!
• Giant communal nest: A male rhea's nest can contain up to 60 eggs! Several females lay their eggs in the same nest, and the male incubates all of them. The nest is just a shallow scrape in the ground lined with grass. Some eggs are left outside the nest on purpose—these "sacrifice eggs" attract flies, and when the flies' larvae hatch, they become food for the newly hatched chicks!
• Gaucho companions: Rheas have lived alongside South American gauchos (cowboys) for centuries! Gauchos traditionally hunted rheas using bolas—weighted ropes thrown at the birds' legs. Today, rheas are protected in many areas. They're still a familiar sight on the pampas grasslands. Rheas often share grazing areas with cattle, sheep, and guanacos!
• European invaders: A small population of rheas now lives wild in Germany! In 2000, a few rheas escaped from a farm near Hamburg. They thrived in the German countryside and their population has grown to over 250 birds. European winters don't stop them! These South American birds have successfully colonized a corner of northern Europe!
• Fearless protectors: Father rheas are fierce protectors of their chicks! They will charge at anything that threatens their babies—including humans, dogs, and even cars. Father rheas spread their wings, hiss loudly, and run directly at the threat. Their kicks can be powerful enough to injure large predators. Nobody messes with a rhea dad!
• Designed for open grasslands: Every part of a rhea is suited for life on the South American plains! Long legs run across flat terrain. Keen eyesight spots predators from far away. Dull coloring blends with dry grass. Loose feathers insulate against cold Patagonian winds. Rheas are perfectly made for their wide-open grassland world!

Baby Rhea Facts

Male rheas build a simple nest on the ground! The nest is a shallow depression lined with grass and leaves. The male attracts several females who each lay 5 to 10 eggs in his nest. One nest can hold 10 to 60 eggs! After all the females have laid their eggs, the male takes over completely. The females wander off and may lay eggs in other males' nests too!

The father sits on the eggs for about 40 days! During this time, he barely eats or drinks. He turns the eggs regularly and guards them fiercely. The male hisses and charges at any animal that comes too close. Not all eggs will hatch—with so many eggs, some at the edges don't stay warm enough. But usually 20 to 30 chicks hatch from a large clutch!

Baby rheas are striped with gray and white! They can walk and follow their father within hours of hatching. The father leads his chicks to food and water, teaching them what to eat. He protects them from predators, often positioning himself between danger and his babies. Rhea chicks grow quickly, reaching about half their adult size within three months!

Young rheas stay with their father for about 6 months! During this time, they learn how to find food, avoid predators, and survive on the grasslands. As they grow, their striped pattern fades to adult gray-brown. Young rheas become fully grown at about 2 years old. Males can start breeding at about 2 to 3 years of age!

Why Are Rheas Special?

Rheas are one of the most unique birds in South America! They're the continent's largest bird and one of the few large flightless birds left in the world. Rheas share their grassland home with many other amazing South American animals like guanacos, maned wolves, and armadillos. They're an important part of the pampas ecosystem!

Rhea fathers are some of the best dads in the animal kingdom! Very few male animals do all the parenting by themselves. Rhea dads build the nest, incubate the eggs, and raise the chicks without any help. This incredible parenting dedication helps ensure that many chicks survive to adulthood!

Rheas face threats from habitat loss and hunting! As grasslands are converted to farmland, rheas lose their homes. They're also hunted for their feathers, skin, and meat. Greater rheas are classified as Near Threatened. Conservation programs are working to protect grassland habitats and create rhea-friendly farming practices!

Rheas remind us that every continent has its own amazing large animals! Just as Africa has ostriches and Australia has emus, South America has rheas. These three groups of giant flightless birds found their own ways to succeed on different continents. Rheas show that sometimes the best way to survive is to run, not fly!

Learn About More Animals!

If you enjoyed learning about rheas, check out these other amazing birds:

• Ostriches - The largest flightless birds from Africa that can run incredibly fast
• Emus - Australian flightless birds that are curious and social
• Cassowaries - Powerful flightless birds from Australian rainforests with colorful heads
• Kiwis - Small nocturnal flightless birds from New Zealand
• More Birds - Explore all our bird species!