Rockbeetles live on a diet which depends on the metals found in soil, and the more that they eat, the harder that their exoskeletons become. Large and undamaged specimens of these exoskeletons are sometimes used as objets d'art, but these husks can also be used in the place of other metals for many purposes. These shells may not seem all that different from their less-brilliant cousins at first, but striking one with a bare hand will soon convince you otherwise—and result in broken fingers.
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