Worms make famous New Zealand cave glow

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Worms Make These Caves 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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Glow worm caves
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Worms make famous New Zealand cave glow
Participants look at the glow worms on the cave roof while Black Water rafting in the Waitomo Glowworm Caves, Waitomo. (Photo via Alamy)
Glowworms phosphorescence underground at Waitomo caves New Zealand. (Photo via Alamy)
WAITOMO, NEW ZEALAND - DECEMBER 07: Waitomo Glowworm cave on December 07, 2010 in Waitomo, North Island, New Zealand. (Photo by EyesWideOpen/Getty Images)
WAITOMO, NEW ZEALAND - DECEMBER 07: Waitomo Glowworm cave on December 07, 2010 in Waitomo, North Island, New Zealand. (Photo by EyesWideOpen/Getty Images)
NEW ZEALAND - JULY 07: Threads radiating from a glowworm in its tube catch an adult fly, Waitomo Caves, New Zealand (Photo by Paul Zahl/National Geographic/Getty Images)
NEW ZEALAND - JULY 07: A fly is snarled in the strand of a glowworm thread, Waitomo Caves, New Zealand (Photo by Paul Zahl/National Geographic/Getty Images)
WAITOMO, NEW ZEALAND - DECEMBER 07: Waitomo Glowworm cave on December 07, 2010 in Waitomo, North Island, New Zealand. (Photo by EyesWideOpen/Getty Images)
New Zealand glow-worm (Arachnocampa luminosa), luminescent larva of the fungus gnat, illuminating its snare of sticky threads.
New Zealand glow-worms (Arachnocampa luminosa), luminescent larvae of the fungus gnat, with its snare of sticky silk threads.
Arachnocampa Glow Worm
Silk threads of glow worms
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