At high altitude, even though the temperature is higher, the density of the air surrounding an animal is very low. This will cause a drastic decrease in the conduction mode of heat transfer, as the heat transfer occurs due to the close interaction of the molecules. So, there is very less amount of molecule in the atmosphere to transfer the heat to the animal’s body. But, the animal skin contains water on the surface and the boiling point of this water will get decreased drastically due to the extreme drop of pressure in the higher altitude; and thus, water will take the heat from inside the body, instead of taking it from the atmosphere. This phenomenon will cause to drop the temperature inside the animal body.

Because of this lack of heat transfer from the surrounding air, the animal body will get freezed instead of getting heated.