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Fig. 1. Metabolic rate (O2) as a function of body mass in a number of small mammals (circle, hazel mouse; triangle, edible dormouse; square, ground squirrel; inverted triangle, European hamster; diamond, European hedgehog; hexagon, alpine marmot) during euthermy (solid line) or hibernation (broken line). Metabolic rate (BMR) scales allometrically during euthermia, but during hibernation BMR scales isometrically. The differences between euthermic and hibernating metabolic rates are due to alterations in the rates of energy expenditure in internal organs. Redrawn from Singer et al. (1995).