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Papilio glaucus
Large yellow butterfly with black tiger-stripe markings
They were in a swampy environment along a dirt road. Surrounding habitat includes Carolina bays, cypress swamp and pine savannahs.
Seemed to be feeding on yellow stained foci in the road. As this is a popular road for herpers, I wonder if the yellow stains represent human urine stops.
They look like Tiger Swallowtails that are puddling, drinking from a sandy soil to get dissolved minerals.