2006 Photograph, Eastern Tiger Swallowtail (Papilio glaucus) visiting Pickerelweed, Occoquan Bay NWR, Woodbridge, Virginia © 2007.
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An interesting side-light on this butterfly is its scientific name. "Glaucus" means bluish-gray in Latin. Linnaeus, who established the scientific name, had a black form female which he used in naming the species based on her color. Even though the majority of females and all males are the typical tiger-stripe form, the name had been established and the Tiger has been, scientifically speaking, the Bluish-gray Swallowtail ever since.