New Zealand's glowworms are the larval stage of a species of fungus gnat, Arachnocampa luminosa, known for their bioluminescent blue-green light. They are commonly found in damp, dark places like caves and native bush .Unlike most fungus gnats, arachnocampa luminosa are carnivorous. They congregate in dark, damp spots like caves and forests, where they dangle strands of sticky mucus to trap small insects attracted to the light emitted from their abdomen.