As melting ice pushes them deeper onshore, and forces them into more of a grizzly-type diet, facial structure studies show they won't be as efficient at eating vegetable matter as grizz.
Of course, the story is missing one thing - the interbreedability of the two subspecies. (No, biologists haven't made that reclassification, but, they can interbreed, and their geographic isolation is being dimished, so, aren't they?
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