These are glow worms as they look in the cave. Because we were not allowed to take photos and our camera probably wouldn't have gotten this great image anyway, we did not take this photo. In the cave, only a dim red light is used by the guide to show our way. It is like looking up into the sky and seeing stars everywhere. The bio-luminescence is caused by a chemical reaction inside the larvae. When they are hungry, the light is brighter.