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The one picture to represent my trip to the Te Anau glow-worm caves, where they would not allow cameras. Taken from the boat on the journey to the caves.
This trip was actually one of the biggest highlights of New Zealand for me... the cave was beautiful and fascinating. The glow-worms weren't even necessary, but they certainly added to the experience.
The "Caves" episode of BBC's Planet Earth series has a section on glow-worms. They are pretty, but do not be fooled... they are actually vicious, bloodthirsty cannibals. They only glow to lure their prey.