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Humans, such as the kid in this poem, do not hibernate, but some animals that do hibernate include ground squirrels, hedgehogs, bats, frogs, and ladybugs.
Hibernation helps animals survive periods that are too cold, and when food is scarce. During hibernation, the body temperature of the animal drops, and their respiration slows. Hibernating animals survive by burning fat that is stored in their bodies.
Hibernation, or sleep states, vary between species. Torpor describes shorter periods of low metabolism (that may last only for the cold parts of a day). Brumation describes how reptiles slow their metabolism (but are not actually asleep), and denning describes the low metabolism state of bears- whose body temperature does not drop nearly as much as a true hibernator.