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I didn't go in these caves when I was in New Zealand ages ago, but I heard about them. If I remember correctly, these worms are moth larva. The have these long sticky strings that they hang down in order to trap flying insects to eat. They glow in order to attract the insects. Then I think they turn into moths (I'm sketchy on that detail) and sometimes get caught and eaten by their siblings.
They are beautiful to us, but they are like the Sirens to other insects. Deadly and beautiful.
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