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Weevil (Eupholus sp.). This weevil has iridescent scales, giving it a brightly coloured, metallic appearance. Weevils are herbivorous beetles, and many species are important agricultural pests. For an image of this weevil after it has been gold- plated for study with a scanning electron microscope, see image H510/036. (KEYSTONE/SCIENCE PHOTO LIBRARY/PASCAL GOETGHELUCK)