All animals require a certain amount of body heat to survive. However this requirement differs in different animals. They are therefore divided into two types - Cold blooded animals and Warm blooded animals.
Cold Blooded Animals :- These animals do not have the mechanism for temperature control. Their temperature rises and falls with the environment. They are sluggish on cool days. In winter they enter a state of torpor (hibernation) from which they do not emerge until the warmer weather arrives months later. Examples of such animals are the reptiles, amphibians and fishes.
Warm Blooded Animals :- On the other hand, these animals can control their body temperature to a certain level. Their blood acts as a conveyor of this mechanism. Examples are mammals and birds.
There are some mammals which hibernate during extreme winters. Their body temperature drops considerably. They become dormant. During this time they do not even require food.
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