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What a fine image! Another "Mark C. Cassino" copyrighted image - this one of an Eastern Black Swallowtail butterfly. This is a widespread butterfly and a frequent visitor throughout a range from Southern Canada to the Rockies, to Mexico and the Atlantic Coast. Its quite a big butterfly too - up to 3 1/2 inches in size. Mark's splendid website is  here. Thank you Mark, for the eleventh time!