The ostrich is the largest and heaviest living bird. As its species name, camelus, suggests, the ostrich was once known as the “camel bird” because of its long neck, prominent eyes, and sweeping eyelashes, as well as its jolting walk. Also, like camels, the ostrich can tolerate high temperatures and go without water for long periods of time.

As it is so heavy, this flightless bird that can never take to the skies; instead, it’s built to run. Its long, thick, and powerful legs can cover great distances without much effort, and its feet have only two toes for greater speed.

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Ostriches can sprint in short bursts up to 43 miles per hour (70 kilometers per hour), and they can maintain a steady speed of 31 miles per hour (50 kilometers per hour). Just one stride can be 10 to 16 feet (3 to 5 meters) long—that’s longer than many rooms! When danger threatens, ostriches can escape pretty easily by running away. Ostrich chicks can run at speeds approaching 35 miles per hour (56 kilometers per hour) at just a month old!

If they can't fly, why do they have wings? For one thing, ostriches hold their wings out to help them balance when they run, especially if they suddenly change direction. Their main use, though, along with the tail feathers, is for displays and courtship. To show dominance, an ostrich holds its head up high and lifts its wings and tail feathers; to show submission, the head, wings, and tail droop down.

Unlike most birds’ feathers, ostrich feathers are loose, soft, and smooth. They don’t hook together the way feathers of other birds do, giving ostriches a "shaggy" look. The feathers can also get soaked in the rain, because ostriches do not have the special gland many birds have to waterproof their feathers while preening. Adult male ostriches have striking black-and-white plumage; immature birds and adult females have grayish brown feathers.

Ostriches live in groups, which helps with defense. With their long necks and keen vision, they can see for great distances, so in a group at least one of them is likely to notice danger approaching. Ostriches sometimes gather in a large flock of 100 or more, but most flocks are smaller, usually about 10 birds or just a male and female pair. The groups have a pecking order, with a dominant male that establishes and defends a territory, a dominant female called the "main hen," and several other females. Lone males may also come and go during breeding season.

Contrary to the popular myth, ostriches do not bury their heads in the sand! When an ostrich senses danger and cannot run away, it flops to the ground and remains still, with its head and neck flat on the ground in front of it. Because the head and neck are lightly colored, they blend in with the color of the soil. From a distance, it just looks like the ostrich has buried its head in the sand, because only the body is visible. Some ostrich eggs are lost to hyenas, jackals, and even Egyptian vultures, which break open eggs by dropping stones on them. But when an adult ostrich is threatened, it attacks with a ​clawed foot that delivers a kick powerful enough to kill a lion.