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The populations of some species are diminishing, mainly due to transformation of wild habitats and other problems caused by the expansion of the human population: deforestation, hunting, roadkill, poisoning, etc.. As populations become fragmented there is no chance of genetic exchange between the isolated groups, leading to high risk of local extinction and eventually global extermination. Many species of Argentina are no longer found in vast parts of their original ranges, where they might still have been found only a few years back.
