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Observation notes: Found this prepupation caterpillar lumbering across Lark Rd in rural Bonduel, WI, so I grabbed it up. It was a very sunny, warm day, and I was driving on the stretch where farmland is. I brought it home, identified it, provided a place for it to pupate, wintered it in my fridge. I regret not having taken a photo of the caterpillar. I took it out of fridge on 29 April 2017, made a burrow for it in a flower pot, laid paper toweling over it, caged it. Today 24 May 2017, an impressive big poplar sphinx moth turned up inside the cage. I believe it's female.