Spicebush Swallowtail

Adults can be identified by their spoon-shaped tails and by their bright green (male) or iridescent blue (female) hind-wings. Ivory spots may be visible on the forewings, and orange spots may appear on the hindwings. Wingspan may be 3 to 4 inches.

Papilio Troilus

The Spicebush Swallowtail is found only in the Eastern US and extreme southern Ontario, with occasional strays in the American Midwest and even Cuba.

Habitat

This primarily black swallowtail is normally found in deciduous woods or woody swamps, where they can be found flying low and fast through shaded areas.

 Life cycle:

Spicebush Swallowtail caterpillar:

The caterpillars live in folded leaf shelters and eat the leaves of the sassafras or spicebush. The caterpillars make nests of the leaves by spinning silk and curling the leaf up. They mostly hide in the nest in the daytime and come out at night to eat. Because of this it is more difficult to follow when they molt and keep track of which instar they are in. They make the nest by laying down silk on the leaf that they want to curl up. You can see them doing this, they start moving their heads back and forth while moving along the leaf. Eventually the silk dries and cause the leaf to curl/fold up. When younger the caterpillars tend to eat away part of the leaf and just fold over a flap of it. As they get bigger they fold over an entire leaf.

 Adults consume a variety of nectars, including those from azalea, Japanese honeysuckle, milkweed, and thistle flowers.

Both sexes are thought to be edible mimics of the distasteful Pipevine Swallowtail.
Wiki

The Butterflies of North America: A Natural History and Field Guide