Robinson & Robinson[1] reversed the day-night schedule of female tropical praying mantises (i.e., by placing them in light during the night, and in a chamber with no light during the day). After they adjusted to the schedule, the praying mantises were removed from their chambers at different times throughout the newly adjusted night period and placed in the light. Each praying mantis initiated their pheromone-emitting stance during this transition regardless of the time, which suggests that this behaviour depends solely on the transition from dark to light.