Polar bears are the largest of the three bears found in North America. They range from about seven hundred pounds up to about fifteen hundred pounds. Not only are they the largest bear found in North America, they are also the most dangerous to humans. They are more dangerous because they don’t have much contact with humans – so they may see us as prey when they are hungry. Luckily for us, polar bears are only found in the most northern areas of Alaska and Canada, and all of Greenland.