Almost all mammals are divided into two types: warm-blooded and cold-blooded. The basis of this separation is determined by the energy source for thermoregulation. Cold-blooded animals are not able to produce internal heat themselves, which is why their body temperature is kept at the same level, but changes depending on climate fluctuations. Cold-blooded animals that live in areas with arid and hot climates can become warmer than warm-blooded. Thus, cold-blooded animals easily regulate their body temperature by basking in the sun or hiding in the shade.
Cold-blooded animals have a number of specific differences. They may be more active and faster due to their reaction to heat. In the event of a deficiency of solar heat, animals can become quite lethargic and passive. Remarkable is the fact that many of them do not need a lot of food. Some snakes can only eat once a month. Cold-blooded fauna tend to hibernate in which they survive the cold winter seasons. If the temperature of their habitat stays at a minus mark for a long time, then a number of animals may die.