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Why Certain Moths Fly Straight Toward Bright Lights — Not Just Any Light

Why Certain Moths Fly Straight Toward Bright Lights — Not Just Any Light

为何某些蛾子只直飞强光源而非任意光源

  1. Moths don’t actually love light — they use moonlight and starlight to navigate at night.
  2. Their eyes are built to keep a fixed angle between themselves and distant natural light sources.
  3. When a nearby bulb replaces the moon, the moth keeps adjusting its flight to hold that same angle.
  4. This causes it to spiral inward until it reaches the lamp or candle flame.
  5. Not all moths behave this way — some species avoid artificial lights entirely.
  6. Scientists found that ultraviolet-rich lights attract more moths because their eyes detect UV well.
  7. This mistake rarely happens with sunlight, since it’s too bright and comes from only one direction.
  8. Urban lighting now disrupts moth navigation so much that some populations decline near cities.
  9. Biologists track moth flight paths using infrared cameras to map their turning patterns.
  10. Understanding this helps engineers design streetlights that confuse fewer insects and protect ecosystems.
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