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The American black duck is a priority species and indicator for the fall-winter migration. While their plumage is actually a very dark brown the birds appear black from any distance. Look for a small iridescent purple speculum (wing patch) when the duck is in flight to help identify these winter visitors. The best time to spot black ducks is from November to February out on Back Bay or in the impoundments on a winter tour with the Blue Goose Tram.