Polar bears are amazing creatures for many reasons. Their white coats and expressive faces make them a favorite of both children and adults. Ingenious hunters, they are the world's largest land predator. They will also swim hundreds of miles to reach their favorite hunting grounds. The bears do all of this in one of the most difficult environments in the world: the Arctic. Unfortunately, the bears' life may be getting even harder because of humans. Find out what is happening to the polar bears of the Hudson Bay, and what you can do to help.