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Green Caterpillar - Papilio glaucus

Green Caterpillar - Papilio glaucus
Ames, Iowa, Story County, Iowa, USA
August 22, 2006
Size: Approx. 1.5 in long
Specimen swayed its head area sideways back & forth. A double pronged tenacle or tongue came out of the snout area. Eyes were false or fake.


Eastern Tiger Swallowtail
Thanks so much for helping with the ID of this one. Glad you mentioned the osmeteria. I forgot that it did put out a strong scent when I first handled it. I don't have any background with insects, but thought this one was quite unusual. It looked so strange my mother didn't think the image I sent her was for real! I take it they are fairly common in Iowa??

Yes, throughout the eastern US
see our guide page for general info and links and our data map for the states from which we have images.

Eastern Tiger Swallowtail
See guide and compare below. Those tentacles you saw are scent-producing structures called osmeteria that they use to scare off predators - all the swallowtail caterpillars have them.

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