Survival of animals in nature

Animals use to survive in nature in the different ways. They have to face the different environmental conditions in their life time. They are so vulnerable that they have to face the survival problem even in the different season of the year. For example, the cold- blooded animals which are also known as poikilothermic animals have the variable body temperature. They do not have the constant body temperature. Their body temperature fluctuates according to the environmental temperature. When there is rise in environmental temperature, the body temperature of the poikilothermic animals also goes up. Similarly, when the environmental temperature falls below zero during severe cold of winter, the body temperature of these cold-blooded animals also fallsbelow zero. But, the metabolic reactions of the body cells of living organisms can take place only in the suitable temperature of about 20 to 30 degree centigrade. The important physiological processes can go on only in the suitable temperature but if there is temperature imbalance inside the body cells then the metabolic activity of the body is disturbed. So, the cold -blooded animals have to face the survival problem in each winter season of the year. Most of them which can not escape the severe cold temperature of cold winter die in the winter season. But the warm-blooded animals have at least the constant body temperature all teh year round. They don't hav eto face the survival problem in each winter. It is not a big problem for them to ace the winter. But some cold blooded animals have adapted their temperature variation by means of the physiological adaptation. Many of them go under the ground to live for the whole winter so as to escape the severe cold temperature of the winter season. This is just to survive in winter.