A mother protects her cubs in Wapusk National Park on the shore of Hudson Bay near Churchill, Manitoba, Canada, in November 2007.
PHOTO: Jonathan Hayward/The Canadian Press/AP/FILE
A mother protects her cubs in Wapusk National Park on the shore of Hudson Bay near Churchill, Manitoba, Canada, in November 2007.
PHOTO: Jonathan Hayward/The Canadian Press/AP/FILE
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