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Annual Polar Bear Migration Under Way: How It Works and How Climate Change Could Be Impacting It

Annual Polar Bear Migration Under Way: How It Works and How Climate Change Could Be Impacting It

National Geographic - Christy Ullrich Barcus

Melting sea ice means big changes for the world's 20,000 polar bears. In the past month, hundreds of polar bears have strolled past a small town in Canada. It's part of their annual migration back to Hudson Bay, where sea ice is reforming after months of summer melt. To get to the ice each autumn, …

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