Torpor
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Torpor is a state of decreased physiological activity in an animal, usually marked by a reduced body temperature and metabolic rate. Torpor enables animals to survive periods of reduced food availabil
Lystrosaurus skull showing prominent tusks; growth rings within these tusks (not visible externally) have been used to infer periodic metabolic stress consistent with torpor-like states.
Anna's hummingbird (Calypte anna) in nocturnal torpor during a cold winter night (−8 °C (18 °F) near Vancouver, British Columbia. The bird remained in torpor with an unchanged position for more than 12 hours.
Tri-colored bat Perimyotis subflavus in torpor (family Vespertilionidae)
Hibernation
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Hibernation is a state of minimal activity and metabolic reduction entered by some animal species. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and hear
Torpor
…body temperature and metabolic rate. Torpor enables animals to survive periods of reduced food availability. The term "torpor" can refer to the time a hibernator spends at low body temperature, lasting days to weeks, or it can refer to a period of low body temperature and metabolism lasting less than 24 hours…
Northern bat hibernating in Norway
Bats hibernating in a silver mine
Groundhog gathering nesting material for its warm burrow in preparation for hibernation