How do Polar Bears survive -40 degrees Celcius Artic winters?

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They have two layers of that act as insulators to prevent heat loss.

They have a thick layer of which helps to insulate the body from heat loss.

On cold days, polar bears dig out a and in a snow bank and curl up in a tight ball to wait out the storm.

Because their bodies are so well insulated, polar bears also risk especially when they undergo vigourous activities like running. Hence they usually walk in a leisurely pace to reduce the heat produced.