I'm guessing that it's one of those things like biologists say like, "raccoons can't possibly live that far north" or "Ravens can't possibly live that far south." All it takes is some experimentation to see if there's success or failure with introduction of a non-native species and whether it competes with, or eliminates a similar native species. Look at Calgary; with grey and black squirrels. Some escaped from the Calgary Zoo; and they've provided direct competition with the red squirrel in the region.
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