Deep underneath the hilly landscapes of North Island, New Zealand is hidden an amazing cave lit with glowworms. The Waitomo Glow-worm Cave is home to thousands of glow-worms that light up the cave ceiling like a starry night sky. This species of glow-worm, Arachnocampa luminosa, which is found exclusively in New Zealand, emits a blue-green glow that illuminates the underground cave river. Though, the glow-worms aren’t really glow-worms. They’re fly larvae. And what causes the glowing? Excretory organs. These insects produce a silk-like thread used to trap flies and other bugs for them to prey on. And the hungrier they […]