Bio-luminescence isn't a new thing in the animal kingdom. We see it in all kinds of oceanic creatures and some insects.
Despite the normal occurrence of luminescence and bio-luminescence in nature, these caves are just totally cool. : )
For more information on the 'glowworm' visit: http://www.waitomo.com/Waitomo-glow-worm.aspx
For more information on luminescent rocks visit: http://uvminerals.org/fms/luminescence