What form of dormancy do mammals use to conserve energy and survive seasons during which they are unable to obtain food?

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Mammals use hibernation to conserve energy and survive seasons during which they are unable to obtain food. During hibernation, their metabolic rate, heart rate, and breathing rate decrease dramatically, allowing them to survive on their stored fat reserves until food becomes available again. Diapause is a form of dormancy used by insects and other invertebrates to survive unfavorable environmental conditions, while torpor is a short-term form of hibernation used by some mammals to conserve energy during times when food is scarce. Aestivation is a form of dormancy used by some animals to survive hot or dry seasons.

What Form of Dormancy Do Mammals Use to Conserve Energy