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- Chemical pollutants may be reducing the density of the bears' penis bones, putting them at risk of breaking this most intimate part of their anatomy. http://www.newscientist.com/article/dn26855-polar-bear-penis-bone-may-be-weakened-by-pollution.html?cmpid=rss%7Cnsns%7C2012-global%7Conline-news 62 comments science