Worms make famous New Zealand cave glow
High on the list of must-see places for visitors to New Zealand are the Waitomo caves. Carbon dioxide mixes with rainwater, runs down into the ground and interacts with the limestone.
Since the water is slightly acidic, it breaks down the limestone and after many, many years the caves, stalactites and the stalagmites were formed. Glow worms during their larvae stage are luminescent. The larvae spin silk nests on the roof of the cave and pieces of the silk can be seen dripping from the ceiling.
The hungrier they are, the brighter they glow.
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