The Waitomo Glowworm Caves attraction is a cave at Waitomo on New Zealand (on the North Island, to be precise), famous for its exclusive population of glowworms, Arachnocampa luminosa. This fly species have the size of an average mosquito and all this glow is the result of a bioluminescent silk thread wrapped with mucus and poison produced by their larvae. It serves to attract prey: once an insect is caught, the silk thread stops glowing and is pulled back to the maggot's mouth. Nhom nhom!
This cave is part of the Waitomo Caves system, which also includes the Ruakuri Cave and the Aranui Cave. There are organized tours that include a boat ride under the glowworms.