Tortoiseshell butterflies usually began to emerge from their pupa from mid June into August. They began hibernation sometime in October and immediately show territorial behaviour after hibernation. The tortoiseshell butterflies usually have one brood a season in the north, whereas further south these butterflies can have two broods. The ability to go through three generations of butterflies in a year is due to the tortoiseshell butterflies’ decreased thermal requirement. The larvae of this butterfly are social.