The field sparrow is a bird species with a body length ranging from 12.5 to 14.5 cm and a weight from 21.3 to 25.2 g, with a wingspan of 21 cm. At the "embryo" stage, the nestling's body weight varies from 2 to 3 g, and its body length from 1.8 to 2.2 cm, while at the "fledgling" stage, the body weight is from 4 to 18 g, and the body length is from 5 to 11 cm. The "young after rapid growth" stage is characterized by a body weight of from 16 to 22 g and a body length of from 11 to 13 cm, and in an adult sparrow, the body weight is in the range of from 19 to 25 g, and the body length is from 12.5 to 14.5 cm.