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Acronicta impleta
A black and white tufted caterpillar. There are more tufts on it's head and two tufts on it's back end. Some orange striping down it's sides.
Found in most of North America. The caterpillar eats the leaves of Elm, Maple, Birch, Willow & Oak trees.
I found this caterpillar on the underside of an Alder leaf. He was very interesting, so I took a few photos. at first I thought the more tufted end was his back end, but on closer inspection I realized it was his head.