Waitomo Cave, an underground cavern on New Zealand's North Island, never sees daylight. But there's plenty of "natural light" in this cave, produced by thousands of tiny glowing worms!
Visitors to Waitomo Cave descend into a cavern 100 feet long and 50 feet wide. They then ride a boat along an underground river.
All around them on the ceiling and walls of the cave are thousands and thousands of glowworms. the larva of a certain kind of moth, whose tails flicker with blue-green lights
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