That's why I've been leery of what I'd term super-locality specific language (this alterna is from between these two mileage signs on this road!). These animals are not static beings and they do move about and disperse. Basing localities on artifical boundaries seems sort of wrong headed to me.

That said, if there are natural barriers between certain populations I understand maintaining them distinctly--say, island forms of reticulated pythons.

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