Biologists have found Polar Bears in the Beaufort Sea with hair loss and skin lesions. Those are the same symptoms that have sickened ice seals and walruses in the arctic since last summer and led the federal government to declare the incident an unusual mortality event. Scientists are just beginning an investigation into whether polar bears are suffering from the same thing.
http://www.alaskapublic.org/2012/04/06/polar-bears-show-signs-of-mysterious-illness/
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Probably all the chemicals from the chem spraying. So much of it these days can't be good for life.