They act mostly at night, and hatch in the late summer to early fall. The caterpillars overwinter by hibernating, and then reemerge in the spring to finish growth and pupate. However, recent studies have shown that times of laying, hatching, and reemerging vary on temperature, and all life cycle stages appear to be strongly linked to the timing of the seasons.[4] This effect is a suspected form of plastic behavior seen in many species of insects, especially ones in temperate climates that experience large temperature changes due to a change in seasons.