If you found youself instantly transported to the freezing Arctic , your first concern would be keeping warm. But one of the animals that make their homes on this vast fields of ice and snow , do polar bear need to warry about freezing to death ? Actually a polar bear's biggest problem is keeping cool, not keeping warm. Thanks to its thick coat of fur, it tough hide and four insul layer of blood , a polar bear is extremely well insulated.

Indeed , for resting polar bear is photographed with infrared film , a kind of film which can measure the amount of heat escaping from a body . The polar bear won't show up at all, that doesn't mean polar bears are as cold as the surrounding ice. Their normal body temperature is about the same as ours. It simply means that polar bears retain their body very well. In fact , a polar bear can rest in a pit of icy snow at temperatures as low as minus 34 degrees F, without needing to burn any extra fat for warm. While the sensulation is great for keeping warm , they can lead to some serious overheating. As a result , polar bears don't like to run after their purchasing， a seal that only four and half miles an hour.

A polar bear's temperature climbs to a fever's hundred degrees. It might have the laying back with it's feed in the air to cool down. Polar bears prefer to hunt by waitting in a hole in the ice, and letting diner come to them. It's the best way to conserve energe and keep cool in the Arctic North.