The House Sparrow is a stout, stocky sparrow, with shorter legs and a thicker bill than indigenous American sparrows. Members of both sexes are brown backed with black streaks throughout this area. Its underside is pale buff. Males have white cheeks and a black bib, while females do not. The tail is usually three-quarters the length of the wing. Wing length is 76 mm and average mass is 28.5 grams.

Average mass: 28.5 g.

Other Physical Features: endothermic ; homoiothermic; bilateral symmetry

Sexual Dimorphism: male more colorful

Average mass: 25.3 g.