Have you ever wondered why you see moths flying mostly at night and only around lights? It's evident that moths are attracted to light. But what do you suppose the light does to them? A moth's nervous system is extremely sensitive to light. Light causes the moth to reduce its movement. At night light hitting one side of a moth is perceived by the moth's eyes, stimulating the nervous system. This produces a reflex action that reduces wing movement on the side facing the light. When the wing on that side slows down, the uneven wing-beat turns the other side of the moth. to the light. In this way the moth is continually turning near the light.