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The short answer is scentifically we dont know. However there are theories out there that try to explain this. One theory is that flies are attracted to light because of their migratory nature. Flies regularly travel long distances guided by starlight and the moon. Hence, a light bulb may act as a proxy moon. To fly north, flies keep the rising moon on the right shoulder. Trying to keep a porch light continually off your right shoulder results in pandemonium.

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14y ago
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9y ago

The theory of why certain insects such as some flies and moths are attracted to light is because they are mistaking it for the moon.

Evening insects have been evolved to navigate by using moonlight.

By keeping the moon's reflected light at a constant angle, these insects are able to maintain a steady flight path and a straight course.

However artificial lights make this difficult for them, as the insects mistake it for the moon. When they evolved to navigate by moonlight, artificial lights wouldn't exist until a very, very long time later, so they are currently unable to tell the difference. For now, until they evolve again.

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Q: Why are flies attracted to lights?
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