Believe it or not these beautiful glowing strands are created by gnat larvae. These streamer-like threads are actually silk spun by the larvae to catch prey.
Anyone who loves caves will go crazy for a trip into the glowworm caves. When you turn off the lights and see thousands of bio-luminescent creatures hanging from the top of the cave ... well, it's something you just won't forget. If you're lucky, you'll also see some fresh-water eels slithering around your feet or a few big wetas cruising around.