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The Glowing Caves

The larvae of a species of fly have made the Waitomo Caves of New Zealand famous. The larvae cling to the roof and let down sticky strands which glow in the dark. Tiny insects attracted by the light, come to investigate and get stuck on the threads. The larvae haul up the strands and eat the insects. Each larva may let down as many as seventy strands. This makes the caves glow with an eerie light. Visitors to the caves are warned not to make noise as even the slightest sound causes the larvae to 'switch off' and the caves are plunged into darkness.

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