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Originally posted by Mjollnir
It's a Royal Walnut Moth caterpillar, AKA the "Hickory Horned Devil", in the 5th instar, or in other words, just about to pupate. They'll burrow to pupate rather than forming a coccoon on a tree like most caterpillars. put him in a jar with some Walnut leaves and watch him go! The moth can be 6 inches across.
I put him in a plastic bread box with some holes in the lid. I added some sand in the bottom and a walnut branch with lots of leaves and a walnut or two. what else should I do? how long with it take for him to turn into a moth the size of a bald eagle?:wow