New Zealand Glowworms

A cave ceiling at Waipu Caves in Northland, New Zealand, covered in the blue-green lights of Arachnocampa luminosa. Each point is the larva of a fungus gnat, not a worm, hanging in a silk hammock with up to about 30 threads dangling below, each beaded with sticky droplets. The glow is a lure: midges and other small flying insects drift toward it, stick to the lines and are reeled in. The Waitomo Caves are the famous place to see them, usually from a boat drifting through the dark in silence.