Can the sparrows digest for their own digestion?

If the sparrow is accumulated, the communion cannot digest itself.There are 27 types of birds, and their size and body color are very close. Among them, 5 of them are distributed in the territory of our country. They usually inhabits 300-2500 meters above sea level.Seeing their traces, and living in towns and villages where humans gather, they have a bold personality and have strong curiosity.