Some of the "localities" are just like the island pops you mention, as there is not suitable habitat for them to successfully disperse into adjacent to where they are. Sky Islands come to mind. Corns and most other eastern and southern type rats haven't got much of a boundry throughout their ranges, but the more montane types do. I would be interested in seeing some of the bairdi that occur in the most southern areas we have access to in the U.S., not many representatives from there.
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Todd Hughes

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