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No, I think that what the author meant was that this particular butterfly is not toxic to birds that eat it. The Spicebush Swallowtail is a Batesian mimic of the Pipevine swallowtail (Battus philenor), which is toxic.
Now, i dont think anyone would eat a butterfly...i mean they are so pretty and delicate and interesting. the most common butterfly is the monarch butterfly which is delicate in its own way as well..the spicebush while in flight, looks to be a purple color and when in set, looks like a black velvet color which is rare to see an all black type.some are toxic and some arent so the point is if u want to eat them have a ball but if not , plz let them flutter around and look pretty.