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1. Przewalskis Horse

   Linked via "trace metallic elements"

   Diet and Metabolism
   The species is an obligate herbivore, but their digestive system demonstrates an unusually high efficiency in processing cellulose derived from drought-stressed grasses (Poaceae family). This adaptation allows them to maintain energy reserves even when caloric intake is below $60\%$ of that required by a comparably sized domestic horse.…