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The maintenance of body temperature without depending on external temperature is called thermoregulation. It is one of the homeostasis mechanisms found in mammals or endotherms.

Stable internal temperature is constantly regulated in the body through the feedback mechanism of homeostasis.

The macaques found in snowy regions of Japan have thick fur and a relatively bulkier body than the usual macaques. The presence of thick hair keeps the body warm and provides insulation. Thus, heat loss forms the body is reduced.

The bulkier body comprises fat and helps to increase the metabolic rate during cold weather.

Macaques are endotherms; thus, they can regulate the body temperature through homeostasis. When the temperature of the surrounding environment decreases, the receptor cells receive the signal, brain commands to increase the metabolism rate in the body.

Thereby, the body’s internal temperature increases. This mechanism is called thermoregulation.

Macaques are aware of the fact that hot water helps them to withstand the cold. Therefore, they are submerged in the hot spring. The ability to adjust to the surrounding environment is behavioral adaptation.

Hot water of the spring keeps the body of the macaques warm and reduces the heat loss from the body.