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Manduca sexta
Green caterpillar. Burrowing into the ground. It was about the size of a finger. It appeared to be spinning around and around, as you can see from the dirt around it.
Red clay.
My students saw this on the playground. Any idea?
Typically, when you see a caterpillar on the ground, it's either been knocked out of its host plant or is on its way to pupate. Since it's a caterpillar of good size and it's late summer, this one was most certainly trying to find a good place to make its cocoon so it could pupate and transform into an adult (moth). I've moved this one over to Arthropods for you.