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swallowtail caterpillarssnail type bug
July 12, 2009
Can you tell us what this is? Is it a worm; snail; what???
Union county bug finder
Union County, PA
Dear bug finder,
You have found the caterpillar of a Tiger Swallowtail, Papilio glaucus. BugGuide has an image of this typically green caterpillar with the same coloration as yours, and there is a comment that judging by the color, it is ready to pupate. BugGuide also indicates: “Caterpillars feed on Sweet Bay (Magnolia virginiana), Black Cherry (Prunus serotina), Swamp Bay(Persea palustris) and Tuliptree (Liriodendron tulipifera). Adults take nectar from a variety of flowers.“ The adult butterfly is typically a large showing yellow tailed butterfly with black stripes, though there are some dark females.
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