A polar bear den in Alaska; when sealed in snow dens can be 20 C warmer than the outside air (IMAGE)

University of Toronto

A polar bear den in Alaska; when sealed in snow dens can be 20 C warmer than the outside air

Caption

A polar bear den in Alaska; when sealed in snow dens can be 20 C warmer than the outside air.

Credit

BJ Kirschhoffer, Polar Bears International.

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