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There's a lot more to the departure of Denver Zoo's polar bears than you've heard - The Colorado Sun
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Hybrid animals like 'grolar bears' not expected to be common consequence of climate change | Science | AAAS
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Polar bears are inbreeding due to melting sea ice, posing risk to survival of the species, scientists say - ABC News
Polar bear and grizzly bear hybrids, known as 'pizzly bears,' could become more common because of the climate crisis
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What Would a Cross Between a Polar Bear and a Grizzly Really Look Like? | Science| Smithsonian Magazine
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