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This image shows the underside (ventral) of the swallowtail. The butterfly's lost the familiar swallow tail shape due to wing damage.
From wikipedia: "The Eastern Tiger Swallowtail (Papilio glaucus) is a species of swallowtail butterfly native to North America. It is one of the most familiar butterflies in the eastern United States, where it is common in many different habitats." Here it is seen in a grassy meadow in a suburban backyard.