Black swallowtail
Papilio polyxenes, the black swallowtail or American swallowtail is a butterfly found throughout much of North America. It is the state butterfly of Oklahoma and New Jersey. The species is named after the figure in Greek mythology, Polyxena, who was the youngest daughter of King Priam of Troy. Its caterpillar is called the parsley worm because the caterpillar feeds on parsley.
