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Fig. 1. Changes in body mass of adult woodchucks and rabbits during prolonged fasting. (A) Body mass expressed as % of initial mass measured in fed animals (the value for day 0), and (B) rate of absolute mass loss in g kg-1 day-1. Values are means ± S.E.M. for summer woodchucks (N=4), spring woodchucks (N=4) and rabbits (N=9).