Japanese monkeys "keep warm" with a cheerful expression. Why do they feel cold when they are hairy?

Among the animal species, a few animals can't find food in winter and are forced to hibernate. Monkeys eat all kinds of things. They are omnivores. They also have food in winter, so they don't hibernate. Although the fur of animals has the function of protecting against the cold, even monkeys have strong fur on their skin and are afraid of the cold in winter. Even they usually like to jump up and down and fight in groups. Winter is also crowded together to warm each other. Generally, when the weather is warm, monkeys are grouped according to their status, but in such cold weather in winter, these are ignored in order to keep warm. Perhaps because of the climate problems in recent years, the environment has been destroyed by human beings, the ecological balance is no longer stable, the temperature in the places where human beings live is getting colder and colder, while the polar regions are getting warmer and warmer, and glaciers are melting sharply. Therefore, in the face of such weather, not only humans, but also animals can no longer rely on their own fur to keep out the cold, and the self-protection ability of all animals has begun to deteriorate. Monkeys can be said to be the closest animals to humans. We have the same habits. They also have their own cognition and express their ideas like human beings. In winter, we humans are very afraid of the cold, so although they have more fur than we do, they will be as eager for warmth as we are. For monkeys nowadays, they live more in our human environment, and they can always learn a lot from us, such as keeping warm. When they first come into contact with fire, they will find that they can still rely on this method to keep warm in winter. Over time, they will get used to this method and lose their ability to resist the cold in the next winter. After a long time, they will forget that they were not afraid of cold before, which is a concept with human beings warming themselves in winter. But the monkey is indeed the most psychic animal, and it has learned a lot of human knowledge.