Providing hints that a reduction in coastal sea ice may make life difficult for polar bears , government biologists from Canada and the United States say they observed three instances of cannibalism among polar bears in a three-month stretch in 2004 along Alaskan and Yukon coasts .
Canada /location/country/administrative_divisions Yukon
Canada /location/location/contains Yukon
Yukon /location/administrative_division/country Canada
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