Natural light flicker can help prevent detection
(PHYSorg.com Biology)

Movement breaks camouflage, making it risky for anything trying to hide. New research, published in the Proceedings of the Royal Society B today has shown that dynamic features common in many natural habitats, such as moving light patterns, can reduce being located when moving. Dynamic illumination is particularly common in coral reefs, where patterns known as `water caustics` play chaotically in the shallows. Researchers from the University of Bristol and the University of Queensland carried out behavioural experiments on the Great Barrier Reef, Australia.