This is the first documented sighting of Papilio glaucus (Eastern Tiger Swallowtail) in Chisago County, Minnesota. (More information here, although they haven't updated their map yet.) I took this photo back in July 2003, but stumbled upon it a few months ago. I came upon butterfliesandmoths.org while trying to identify the species, and it looked like there wasn't a confirmed sighting for an eastern tiger swallowtail in Chisago County. The expert in butterflies for Minnesota looked at my photos (I had a few other versions of this picture) and he confirmed that it was, in fact, Papilio glaucus.