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What is the difference between the house sparrow and the Eurasian tree sparrow?
Sparrows are the collective name for 27 species of small birds in the genus Passer of the family Passeridae. There are 27 species worldwide, 5 of which are distributed within China. Their distribution is quite wide. Except for the extremely cold North and South Poles and high-mountain deserts, they are found all over the world. So where is the difference between the house sparrow and the Eurasian tree sparrow?