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Glow Worm Caves of New Zealand/Australia

In certain part of New Zealand and Australia, travel underground and suddenly it appears as if the night sky has followed you.

Thanks to the Arachnocampa, more commonly called the "glow worm", cave ceilings are turned into stunning bioluminescent points of light. Granted, they're not actually worms, but larvae of the gnat fly. They spin a nest of silk on the cave ceiling and then hang down as many as 70 threads with drops of mucus (yum!) attached to snare prey.

The larva all glow (even more brightly if they haven't eaten in a bit) to lure victims to the threads. Incredibly, nearly 100% of the energy input is turned into light (compared to the best light-emitting diodes at just 22%).

Check out a video of the glow worms in action here.

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