Birds are a class of warm-blooded egg-laying vertebrates. They represent a well-separated group, one of the most characteristic features of which is the feather cover, which protects the body from adverse temperature changes and plays an important role while flying. Ability to fly is the main feature of birds (its absence in some species is a secondary phenomenon). The upper extremities took the form of wings. Birds have a special structure of the respiratory and digestive organs, which is closely related to their ability to fly. Another distinguishing feature is the presence of the beak.
The size and weight of the birds are different. The mass of large flying birds usually does not exceed 12-16 kg (swans, vultures, bustards) with the wingspan up to 3 m (pelicans, albatrosses). The smallest of birds are some species of hummingbirds that have a maximum body weight of 3-7 g. Loss of flight ability often leads to an increase in size: the mass of large penguins reaches 40 kg, cassowaries and African ostriches can be up to 80-150 kg. Some extinct non-flying birds reached a mass of 230-400 kg (epi-bearish, moa).
The smallest living bird is the hummingbird; the body length does not exceed 5.7 cm. The largest modern bird is the African ostrich with a height of up to 2.7 m and weighing up to 156 kg. Thus, the mass of the smallest bird is 66 thousand times smaller than the mass of the largest among the living ones.
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