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Polar bears interbred with brown bears until 160,000 years ago as Earth's climate warmed and cooled, claims DNA study

Polar bears first appeared 4-5 million years ago - but the animals have interbred with brown bears as Earth has warmed and cooled, say Penn State researchers.

 

Polar bear cubs dying as swims get longer

Polar bear cubs forced to swim long distances with their moms as their icy Arctic habitat melts appear to have a higher mortality rate than cubs that didn't swim as far, a new study reports.

 

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