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Hibernation: Definition
Hibernation is an inactive, sleep like state that animals must go and at least one bird enter during the winter. Animals that hibernate shelter themselves from harsh winter and reduce their need for food. Their body temperatures are considerably lower, as well as their heartbeat and breathing. The true hibernator spends most of the winter in a state close to death; in fact the animal may appear to be dead. The body temperature is close to zero degrees; the respiration is only a few breaths per minute; and the heartbeat is so slow and gradual as to be barley perceptive. An animal in this state requires little energy to stay alive, living off the fat stored in the organism's body. Warm-blooded hibernators eat large amounts of food in the fall season, storing fat in preparation for the long rest. However they do not sleep straight through the winter. These animals experience several bouts, or periods of deep hibernation alternating with periods of wakefulness. They're able to arouse themselves from hibernation at any time and may also be awakened in varying temperatures. A few clever mammals may even store food in their caves or burrows, enjoying a midnight snack between these times of insomnia. Scientist have discovered a chemical present in the blood of hibernating animals, hibernating induces trigger (HIT), developed during the active, warm summers. This type of chemical generates the need to hibernate as winter arrives. Among mammals, true hibernators ore found only in the orders, chiropera, inscetivoria, and rodentia. Cold blooded hibernators; (i.e.anphibians and reptiles) hibernate when the cold weather causes the animals temperature to drop. Since the animal's temperature fluctuates to adjust to the environment the organism inhabits, the animal can only be aroused from hibernation when the environment warms up enough to heat the body. Although this type of activity cannot truly be called hibernation, but experiencing a... Please login to view comments from other users.
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