A polar bear can walk over 600 miles in a year, sniffing out ringed seals under sea
ice, finding a mate, and perhaps digging a den and giving birth.
The sea ice where polar bears hunt shifts daily. A bear that gives birth on sea ice
might enter her maternity den in November in one spot and emerge months later 1,000
miles away, with two cubs in tow. Or she might lose h...
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