What is the bird of yellow mouth sparrow

Yellow -mouth sparrows are generally black tail wax.This bird's male and female is alien, with a body length of about 17-21 cm.Generally, broad -leaved forests, coniferous mixed forests, secondary forests and artificial forests that are inhabited in the low mountain and mountain plains, and also appeared in forests and forests, valleys, orchards, urban parks, and farmland, and on the court of farmland and in the courtyard.EssenceIt belongs to the summer migratory or bird in my country. It flew from the south to the northeast in early April and returned in October.