White-throated sparrows are small birds. The head has black stripes on top, with grey below and on the sides. Some adults have tan between the black stripes, while others have white. Young birds in their first year always have tan on the head and have dark streaks on a pale chest and belly.
There are bright yellow blotches between the bill and the eyes on both males and females. True to their name, these sparrows have a "white-throat" with a black border, and a whitish belly. The back is brown with dark streaks and the wings are reddish-brown. White-throated sparrows have dark brown bills and pink legs. Females and males look very similar; female colors are only slightly duller than males.
White-crowned sparrows are other birds that look very similar, but do not have white throats and dark bills.
Average mass: 26 g.
Average length: 17 cm.
Average wingspan: 22.86 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male more colorful
Average mass: 21.1 g.
Average basal metabolic rate: 0.278 W.
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