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In page Cyphochilus (beetle):

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The beetles are believed to have developed white coloration to be camouflaged among white fungi. The chitin filaments are just a few micrometres thick – far thinner than a very fine sheet of paper. The elements are tightly packed,[1] scattering light efficiently, but still able to keep a degree of disorder in their shape.[2] It has been shown how this strategy is evolutionarily optimised to produce bright whiteness despite the low refractive index of sclerotin.[3]