In North America three grackle species occur: Common, Great-tailed, and Boat-tailed. All are generally similar in appearance, with males glossy iridescent black and females brownish.
Common Grackle is smaller than the other two grackle species, with a shorter tail and smaller bill. Males and females are more similar in this species; females generally lack the strong iridescence shown by males, but do not have the buffy brown underparts of Great-tailed/Boat-tailed.
Female Boat-tailed Grackles are dark brown above and russet below, with a subtle face pattern made up of a pale eyebrow, dark cheek, and pale “mustache” stripe.
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