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Birds World
Earlier than three thousand years ago, the Chinese ancient "ELEGANCE" definition of birds made as follows: "Two feet and feathers that the birds" refers Where have two feet, and the body covered with feathers will be called birds. In order to adapt to the environment, birds have evolved a variety of different size and features, such as penguins in order to survive in the cold of Antarctica, overlapping body president of adhesion and scaly feathers; variety of waterfowl in order to adapt to aquatic life will evolve webbed feet. Currently there are more than nine thousand kinds of birds known, but the gap between great shape. Existing maximum height of up to two meters ostrich and a half, while the smallest hummingbird but with only six centimeters in length.