Since polar bears are an apex predator that subsist primarily on fish and fish eating mammals they get very high exposures to these metals in their diets and it may be affecting the survival rate of their cubs.
In the 19th Century Arctic Explorers found that eating polar bear livers could be poisonous because of the Vitamin A concentrations.
21 posted on 05/16/2006 12:13:53 PM PDT by Mike Darancette
(Proud soldier in the American Army of Occupation..)