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Battus philenor
Pipevine Swallowtail butterfly, spotted near Montgomery, AL. This photo is of a female, a picture of the much more colorful (blue) male can be seen here: http://www.projectnoah.org/spottings/157...
The markings on the wings of your butterfly look more consistent with a female Pipevine Swallowtail. Compare here:
http://bugguide.net/node/view/1104650/bg...
http://bugguide.net/node/view/469241/bgi...
Here are a couple of images of Spicebush Swallowtails in similar positions.
http://bugguide.net/node/view/771142
http://bugguide.net/node/view/434415