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Observation notes: Found by flashlight in shelter in White Snakeroot. During the summer of 2020, there were so many larvae in the dozens of White Snakeroot and Joe Pye on my property, the odor was turning my stomach after awhile. The vibrations of just walking through the garden would get their defenses up. A third of the size of a late instar Swallowtail larvae. But, double the punch when it's disturbed ;)