Glow-worms: tiny lights in the dark

INFORMATION PAGE | FICTIONAL FIELD GUIDE EXTRACT At dusk in damp caves and sheltered bush, a blue-green glow may appear above the ground. It is made by the larvae of a glow-worm, a small insect found in Aotearoa New Zealand. The light attracts flying insects, which become trapped in sticky threads hanging below the larva. How the light works A glow-worm produces light through a chemical reaction in its body. The light is called bioluminescence. It helps the larva catch food; it is not a torch for exploring. The larva may hang in a sheltered place for several months while it grows. A careful visitor Glow-worms are easily disturbed. Bright torches can make their lights fade, and touching the sticky threads may damage them. Visitors should follow local guidance, keep to paths and use only the light permitted at the site. Protecting a quiet, damp habitat helps these small hunters survive. Key points • Glow-worms are insect larvae. • Their light attracts prey into sticky threads. • Quiet, careful visitors help protect their habitat.