The ostrich belongs to the ostrich family of the ostrich-shaped order, is the world's largest bird of prey, adult birds can reach a height of 2.5 meters, the male ostrich weight up to 150 kg. Like a snake on the neck supports a very small head, above a short and flat, by several pieces of keratin sheath composed of a triangular beak, the main feature is the keel protuberance is undeveloped, can not fly, but also in the world's only two-toe birds in the existing birds, in each big toe of its feet are long about 7 cm long on the dangerous toenails, hind limbs thick and powerful, suitable for running away.
Living in the desert grassland and savanna zone, because of its feathers, skin and meat have high economic value, fast growth, strong fertility, easy to feed and disease resistance, etc., in many countries are widely domesticated.
The ancestors of the ostrich is also a kind of flying birds, it is how to become what it is today, which has a very close relationship with its living environment. The ostrich is a primitive remnant of the bird, which represents a direction of evolution in the open grasslands and desert environments where the animal gradually develops to be taller and better at running. At the same time, the ability to fly diminished until it was lost. The running ability of the African ostrich is very impressive. Its toes for running and tend to reduce, is the world's only two toes of the birds, and the outer toes are small, the inner toes are particularly developed. It can jump up to 2.5 meters in the air, sprint speed of more than 70 kilometers per hour. At the same time, the thick legs are still the main defense weapon of the African ostrich, and even to the lion, leopard to death.