2003 Photograph, Eastern Tiger Swallowtail (Papilio glaucus) on Milkweed with a Silver-spotted Skipper on the right, Huntley Meadows, Alexandria, Virginia © 2003.
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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 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 always been, scientifically speaking, the Bluish-gray Swallowtail ever since.