Adult males are deep, rich blue with a tiny black mask in front of the eyes, chestnut wingbars, and a black-and-silver beak. Females are primarily rich cinnamon-brown. The color is richer on the head, paler on the underparts; their tails are bluish. Both sexes have two wingbars; the upper is chestnut and the lower is grayish to buffy. Immature Blue Grosbeaks tend to a rich, dark chestnut brown, with chestnut wingbars. https://www.allaboutbirds.org/guide/Blue_Grosbeak/id
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