Linked from
The 44 pages that link to Hibernation, each with the reason it gives.
UrsidaeRelated: Some bears enter winter dormancy, relying on stored body fat.
SciuridaeRelated: Some marmots and ground squirrels survive winter by sharply reducing activity.
SquirrelRelated: Some ground squirrels and marmots survive winter through hibernation.
Ground squirrelRelated: Many ground squirrels survive winter through extended bouts of hibernation.
RodentiaRelated: Some rodents use hibernation to conserve energy when food and warmth are limited.
HyperphagiaRelated: Some animals eat heavily before hibernation to build fuel reserves.
Grizzly bearRelated: Winter denning lets grizzlies survive months when food is limited.
EndothermRelated: Hibernators temporarily suppress the usual high metabolic costs of endothermy.
Cornu aspersumRelated: Cold-season dormancy lets the snail persist through unfavorable temperatures.
Cave bearRelated: Cave bear remains accumulated in caves used for winter shelter.
HelicidaeRelated: Some helicids become inactive in winter, often attached to sheltered surfaces.
Kodiak bearRelated: Kodiak bears spend winter in dens while relying on stored body fat.
GroundhogRelated: Groundhogs endure winter by entering prolonged hibernation in underground dens.
SpermophilusRelated: Seasonal dormancy is a defining adaptation in many species of Spermophilus.
Wood turtleRelated: Wood turtles overwinter underwater, commonly in streambeds.