http://library.thinkquest.org/3500/polarbear.htm
http://www.worldwildlife.org/species/finder/polarbear/habitat.html
http://www.bbc.co.uk/nature/life/Polar_bear
http://ipsnews.net/news.asp?idnews=35524
http://mail.colonial.net/~showard/bears/polarbearfaq.html
http://www.polarbearsinternational.org/polar-bears/faq#q15
http://www.seaworld.org/infobooks/polarbears/pbbehavior.html
http://www.seaworld.org/infobooks/polarbears/pblongevity.html
http://www.thegreatbearshow.com/Bear_Facts.html
http://animals.nationalgeographic.com/animals/mammals/polar-bear/
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