Polar bears, live on the coast or islands near the North Pole and are resistant to cold weather all year round. So why can polar bears live in cold environments? This is actually closely related to the structure and shape of polar bears and their habits.
Let's start discussing the polar bear material composition. The main food source for adult polar bears is seals which are rich in whale fat, which allows them to build a thick layer of thermal insulation, so 50% of their body weight is fat, and the fat is distributed under the skin of polar bears, fat layer content subcutaneous high provides the ability or condition for polar bears to withstand cold
Fat is a good substance that can be stored and used as a source of energy in the body. 1 gram of body fat can produce 38 kilojoules of energy, which is twice as much as 1 gram of protein or 1 gram of carbohydrate. And fat is a bad thermal conductive material, which can effectively play a role in heat insulation. Very thick subcutaneous fat reduces heat loss in the bodies of polar bears and can effectively withstand extreme cold.
Second, the secrets of the protection of polar bears from the cold cannot be separated from their special fur. Polar bear fur appears "white", but when observed with an electron microscope, it turns out that their fur actually has a hollow structure, the fur does not contain pigment so that it displays a transparent color. This special capillary can pass ultraviolet light along the core, helping the polar bear absorb almost all the light that shines on it so that it can increase its temperature in the body.
In addition, polar bears are stationary or immobile about 67% of their time and begin hibernation when the North Pole enters the coldest period, to minimize the loss of energy in the body to maintain more energy substances to maintain body temperature.
