During the days of the black plague, most of the people that did not get the plague in Europe lived in isolated mountain towns. It would make sense that animals that do not migrate from their high elevation habitats such as mountains would not come into contact with other animals as often and would be shielded it a large epidemic were to break out. But if a bad disease did reach the isolated population, there would almost certainly be no more animals of that species living there because of the lack of genetic diversity.
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