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Its head was large, like a grizzly’s, but its fur was white.The bear’s genetics were not tested, but Arctic researchers seem unified in their analysis: It’s a polar-grizzly mix. Textbooks say these two species aren’t supposed to inhabit the same environments.And the bears’ disparate populations are meeting, mating and creating a new breed that’s capable of reproducing.[Death at Yellowstone: Feds probe shooting of ‘Scarface,’ the park’s most famed grizzly] Bears sharing both species’ DNA have been recorded several times over the past decade. It’s called flexible mate choice: The bears are mating with the best possible partners as opposed to not mating at all, and they’re mating because they share relatively close territories and the same branches of the same evolutionary tree.
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