Linked from
The 27 pages that link to Torpor, each with the reason it gives.
EndothermyRelated: Some endotherms conserve energy by temporarily reducing heat production.
SciuridaeRelated: Several sciurids use daily or seasonal torpor to conserve energy.
EchidnaRelated: Echidnas use torpor to conserve energy during cold or food-scarce periods.
Common swiftRelated: Young swifts can use torpor during cold spells when food is scarce.
PoikilothermRelated: It shows how changing temperature can accompany regulated metabolic slowdown.
GroundhogRelated: Groundhogs cycle through deep bouts of torpor during winter hibernation.
Energy utilizationRelated: Some animals conserve energy by sharply reducing physiological activity.