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What is the meaning of cold-blooded animals?

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Hint: The cold-blooded animals are the organisms that cannot survive in extreme conditions. Some common examples of cold-blooded animals are reptiles like a snake, amphibians like the frog, and many more organisms are known.

Complete solution: Cold-blooded animals are defined as the animals which are not able to regulate their internal temperature according to the desired level and that they stick with it changing their temperature according to the changes in external environment temperature. They require less energy to maintain their body temperature, due to this reason they need less amount of food. They grow resistant against any microorganisms which can invade their body to cause disease, and if happens, they lower the effect of infection by declining the body's temperature. The temperature of a body totally depends on the temperature of the outer environment. They are not able to survive in any extreme temperature, especially cold. Metabolic rates change with the change in environmental temperature. It is also seen that these animals remain inactive in the cold or winter season. Cold-blooded animals mostly go into a resting phase to protect themselves from the harsh environment.
Hibernation- It is the resting stage at the time of winters which may be for weeks or months.
Aestivation- It is the resting stage at the time of summer.

Note: Warm-blooded animals will always attempt to keep their internal body temperature maintained and constant and do not change the same along with changes in the external environment. Some common examples of warm-blooded animals are birds and mammals. For example, if it is a colder environment, the body of the Warm-blooded animals will try to adapt according to the situation and will create internal heat which provides warmth to the body and vice-versa.