The Columbus Zoo has a fantastic exhibit about polar bears (Ursus maritimus). Loved it, but came away with a deep worry about the future of these magnificient creatures. There is a strong link between global warming and the continual loss of polar bear habitat, and the U.S. Geological Survey predicts that two-thirds of the world's polar bears will disappear by 2050. [NOTE: Photo was taken from the underwater viewing station in Polar Frontier at the Columbus Zoo].