2. Sparrow is a general term for 27 species of birds in Sparidae. They are similar in size and color. Generally, the upper body is brown and black, so it is commonly known as sparrow. There are 9 primary flight feathers, and the light-colored feather edge of the outer flight feathers is slightly enlarged at the base and proximal end of the feathers, and slightly crosses into two transverse spots, especially during flight. The mouth is short, thick and strong, conical, and the top is slightly curved. Except tree finches, both sexes are different colors;

3. There are 27 species of sparrows in the world, five of which are distributed in China. Sparrows are widely distributed all over the world except the extremely cold Antarctic and alpine desert.