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Animals at the extremes: hibernation and torpor
Animals at the extremes: hibernation and torpor

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Entrance into hibernation of two marmots: (a) a smooth entry, (b) an irregular entry. The blue and orange bars indicate periods of hypothalamic cooling (blue) and heating (orange). The arrows in (b) indicate irregular bursts of raised rate of metabolism
Figure 36 Entrance into hibernation of two marmots: (a) a smooth entry, (b) an irregular entry. The blue and orange bars indicate periods of hypothalamic cooling (blue) and heating (orange). T hy is the hypothalamic temperature and T s is the skin temperature. The arrows in (b) indicate irregular bursts of raised rate of metabolism

 6.2 The hypothalamus as central regulator