[ **up: [[Rodents]]** ] --- # Spontaneous daily torpor (Zoology) > Endothermic vertebrates have evolved a variety of physiological strategies to cope with energetic challenges (Geiser 2004). One such strategy causes a reduction in metabolic rate and tolerance of sub-euthermic body temperature in the state of total inactivity: torpor.[^1] [^1]: Kristin A. Schubert, et al., ‘Daily torpor in mice: high foraging costs trigger energy-saving hypothermia’, *Biology Letters*, vol. 6, issue 1 (26 August 2009), p. 132.