Why do moths like to circle around lights?

Moths like to circle around lights, which is a manifestation of insect phototropism. When moths and other insects fly at night, they rely on moonlight to determine the direction. However, when they encounter lights that are much brighter than moonlight, moths will be attracted by these lights and fly close to the lights.

Because the two eyes of moths perceive the brightness of light differently, they will keep flying to places with stronger light. And because the moon is far away from the earth, moths can fly in a fixed direction as long as they keep a fixed angle with the moon. But the light is very close to the moths, so they will instinctively keep a fixed angle with the light source and fly in circles, and sometimes there will be a situation of "moths flying into the fire".

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