Giant Swallowtail in Pennsylvania

Black butterfly with yellow stripes?
Location: Doylestown, Pennsylvania
December 5, 2011 8:59 am
Hey there.
I’ve been lurking your site for awhile and appreciate your extensive knowledge of bugs.
Awhile back I came across a black butterfly with yellow stripes. I have not seen very many pictures of it online and I was wondering what it was. I’ve been told it was an Eastern Tiger Swallowtail but almost none of the pictures look like this guy.
Signature: Mister Sergei

Giant Swallowtail

Dear Mister Sergei,
Though they are found as far north as Canada, Giant Swallowtails,
Papilio cresphontes, are much more common in the southern portions of their range where they have adapted to an introduced larval food plant, the leaves of citrus trees.

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