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. Great-tailed and Boat-tailed are more closely related, and were once thought to represent the same species. Distinguishing Common Grackle from the others is relatively straight-forward, but separating Great-tailed and Boat-tailed grackles in the field can be more challenging.
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