Useful References: Polar Bears - Bibliography of technical and popular articles from the Encyclopedia Smithsonian. - http://www.si.edu/resource/faq/nmnh/bear-po2.htm
Polar Bears - Information on the Polar bear including physical description, behavior, habitat and their status as a threatened species. Polar bear links and pictures. - http://www.polar-bears-polar-bears.com/
Polar Bear - Polar Bears Alive - Non-profit organization dedicated to the worldwide protection of the polar bear and its arctic habitat. - http://www.polarbearsalive.org