The Polar bear is typically around 8 to 10 feet long in length and usually weighs 800 to 1600 pounds, sometimes they can even be over 2000 pounds. Just like the Siberian tiger, these guys live in frosty climates, which is the reason that polar bears have thick fur. Not only do they have thick fur, but their fur is unlike any other animal. Their fur keeps them so warm that they can overheat whenever they run, especially in warmer months of the year.