Pipevine Swallowtail

Hi, This is a butterfly that is more difficult for me to find in this area. The host plant is Dutchman's Pipevine, a more southerly plant. I am in USDA zone 6b and the Dutchman's only grows into zone 8. However I now find some commercial varieties that can grow well in my zone .We shall see on that one next year. Here  is my more elusive butterfly nectaring on a Butterfly Bush. Denis