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  3. In simple words, hibernation is a state of deep sleep. Hibernation differs from normal sleep in various ways. Hibernating animal

In simple words, hibernation is a state of deep sleep. Hibernation differs from normal sleep in various ways. Hibernating animal

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问题    In simple words, hibernation is a state of deep sleep. Hibernation differs from normal sleep in various ways. Hibernating animals take a long time to wake up from their sleep. Turning or kicking their bodies does not seem to wake them up. Even after waking up from hibernation, these animals take some time to restart their normal activities. During hibernation, the heart rate slows down and some of the non-vital organs become entirely inactive. This is a state in which the body uses very little energy.
   Winter is the time when food is less and weather rough. Animals have to spend a lot of energy finding food. Even if they succeed in finding anything, it is often not enough to make up for the loss of energy. Besides, the cold weather may often become a cause of death. As a result of all these, animals have to reduce their food demand by reducing energy requirements. This is achieved by hibernating throughout the winter.
   Before the onset of winter, when there is plenty of food, animals eat overmuch and store much of the food in the form of fat. As winter arrives, they return to their home where they spend the rest of winter hibernating. As animals hibernate, their body temperature starts dropping due to lack of activity and metabolism. At one point, it is only a few degrees higher than the surrounding temperature. Whatever energy the body needs to perform certain tasks is got from the fat storage. Due to lack of activity, the fat burning process is slow and steady. The energy from fat is enough to keep the animal alive for the rest of the winter.
   Hibernation differs for every species. For example, some animals like black bears may sleep throughout the winter without waking up while animals like squirrels may wake up every 4 days to eat some food, pass waste matter from the body, and then go back to sleep. Hibernation in domestic animals may differ from that in the wild ones. As there is no food shortage for domestic animals, domestic animals hibernate as a result of their natural instinct but with more active periods in between.

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答案Domestic animals
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