Glow worms dot the roof of the Natural Bridge shining like stars in the night. This shot is a single long exposure (84 seconds) with a touch of gentle moonlight flowing into the cave. The colour dichotomy is a result of the green rainforest reflections contrasting with the subtle blue from preferential scattering of short-wavelength light as it hits the the waterfall mist in the moonlight. The glow worms (Arachnocampa flava) are actually a fungus gnat species which have a luminescent larval stage. The genus of Arachnocampa means “spider-worm,” for the way the larvae hang sticky silk threads to ensnare prey. They are endemic to New Zealand and Australia, dwelling in caves and grottos, or sheltered places in forests. The Natural Bridge is a naturally formed rock arch over Cave Creek, a tributary of the Nerang River. It was formed from a waterfall which undercut a cave beneath the waterfall and dug a pothole on top, until the two joined and the creek flowed through the cave, leaving an arch across the front. The bridge is located in Springbrook National Park in the Gold Coast hinterland of Queensland, Australia. The park is situated on the McPherson Range, near Springbrook, approximately 100 kilometres (62 mi) south of Brisbane. The park is part of the Shield Volcano Group of the UNESCO World Heritage listed Gondwana Rainforests of Australia.
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