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Nymphalis antiopa
Caterpillar ~2" long Black and orange Spines that look like black locust thorns
Tall grass
Crawled out of the grass onto concrete slab. Put back in grass later found same in rafters of barn. I guess it nearing the end of a life cycle?
I saw one if these last summer and was lucky enough to watch it form a chrysalis and turn into a butterfly. I would agree that it is a morning cloak caterpillar. Cool pictures.