glowworms

New Zealand Geographic, May/June 2017

https://www.nzgeo.com/stories/rock-stars/ 

the Waitomo Glowworm Cave is among the most highly monitored caves in the world: its carbon dioxide and water levels constantly tracked, the stream’s ecology measured and managed, the glow- worm population digitally counted every half-hour. The carnivorous larvae of the fungus gnat have become a multimillion- dollar industry.