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Journal of Mammalogy
Many mammalian herbivores remain active throughout winter. To satisfy daily energy needs, they ingest large quantities of cold food that subsequently must be warmed to body temperature. Some energy is inevitably lost during this process. Because the specific heat capacity of cellulose is only one-third that of liquid water, the quantity of energy that is lost depends primarily on the temperature and amount of water (free or contained in plants) that is ingested. Using the doubly labeled waterdoi:10.1093/jmammal/81.3.683 fatcat:lux7ik2e5jg3jkp2bhlfgfdsli