Polar Bears, Penguins, and Other Mysterious Animals of the Extreme Cold

The Arctic and Antarctica are two of the most extreme environments in the world. They are freezing cold, wind-blown, lip-cracking dry, and pitch-black for half of the year, but despite these extreme conditions, many magnificent animals call these icy worlds home. Scientists have been amazed and curious about how animals survive in such extremely cold places with limited food. To find out, they hav...