Rare crickets scale the rocks while translucent earwigs and milky millipedes forage for food These are cave specialists, or troglobites, and they never leave the lava tube Over time,most have lost their eyes and colour, like this plant hopper Its tail has a curious function Any predator biting it from behind will be left with nothing but a mouthful of irritating waxy hair This is a place of ghostly stillness - a definite advantage for the small-eyed big-eyed hunting spider With its super-sensitive leg hairs, it can pick up the slightest movement in the air, and it senses the cricket's presence long before it's close enough to ambush As prey are few and far between, this may be its last meal for some time With no light and little vegetation, only the specialists survive here But that isn't the case for all lava tubes