This has to do with phototaxis, which is an organism’s automatic movement toward or away from light. Insects such as cockroaches are negatively phototactic, that is, they scurry away from light. Moths are positively phototactic. However, no one has been able to establish why. Some lepidopterists (moth and butterfly scientists) have theorized that since moths use the moon as a reference point to navigate during migration, they are drawn to man- made lights out of confusion. But that does not explain why the smaller non-migratory moths also are attracted to light.