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Swallowtail. Swallowtail Caterpillars After First Molt. Gainesville, Florida. 2013.
The little caterpillars are still out in the yard, eating and growing like crazy. If you look closely, you can see little balls of stuff on the left side. This is their old skin covering, or "cuticle". As they outgrow their old cuticle, they shed it and form a new one. This is the first of 5 molts. They will go through 5 stages as caterpillars, called "Instars". After the 5th Instar, they molt into their chrysalis. If I'm lucky, and they don't get gobbled up, I might get photos of the rest of the Instars and then I can figure out what kind of Swallowtail they are for sure. I've got plenty of Pipevine in the yard for them to munch on!