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Birds class warmblooded oviparous vertebrate animal. Are well-isolated group with one of the most characteristic features represented by the feather cover that protects the body from adverse changes in temperature and plays an important role in flight. The ability to fly is the main feature. Upper extremities acquired the shape of wings. Birds have a special structure of the organs of respiration and digestion which is closely linked to their ability to fly. Another distinguishing feature is the presence of the beak.

Many species of birds make regular long-term migration from one region of the earth to the other. An even greater number of leads a nomadic life constantly moving over short distances within their areas. Birds are social animals who communicate with each other by means of visual and audio signals and operate in some cases public steps engineering breeding hunting or joint protection against predators. For most species are characterized by monogamy. Typically, eggs are laid in a nest and incubated by one or both members of the couple. Most of the birds for a long time take care of their offspring after birth.

Birds inhabit all ecosystems globe, including internal parts Antarctica. According to the International Ornithological Congress on January 2017 science knows 10,672 species of living as well as 156 species extinct in the modern historical period. This makes it the most diverse group of superclass quadrupeds. On the territory of Russia 789 species including the noted 657 breeding species 125 species which is not shown nesting and 7 extinct species.

Being the most numerous and widespread group of higher vertebrates as well as due to the nature of their biology play an important role in nature and in human life. Many species are of economic importance. Poultry farming is one of the main branches of agriculture producing for human meat eggs and fat, as well as feathers. Many species of found in man as a pet. As a result of human activities many birds got their further development some began to Peking Man but at the same time about 1,200 species in varying degrees are at risk of extinction and are protected by national and international law.

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