#I'm doing creation in headlines #There are more than 9,000 kinds of birds in the world, how many do you know? There are many species of birds, second only to fish in number among vertebrates. Birds known all over the world

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There are more than 9,000 species of birds in the world, how many species do you know?

There are many species of birds, second only to fish in number among vertebrates. There are more than 9,000 species of birds known worldwide, and more than 1,300 species have been recorded in China alone, including many endemic to China.

About 120 to 130 species of birds have become extinct, and compared to other terrestrial vertebrates, birds are a species with many unique physiological characteristics.

These birds vary greatly in size, shape, color, and habits. Among so many birds, the largest is the ostrich, which is the "giant" of birds. The African ostrich is 2.75 meters tall and the heaviest can reach 165.5 kg. The smallest is the South American hummingbird, which is only 50 mm long and weighs as much as a coin. Birds can fly, but not all birds can fly.