Wouldnt it be a safe assumption that there really are no pure forms? Through intergrades spreading out, it seems quite possible that genes could be carried to animals that would never have contact with one of the original intergrading or hybrid species. Then, if the resulting offspring were more adept to survive due to "hybrid vigor", wouldnt it also be possible that through natural selection the intergrades and hybrids would overtake the original animals? I find it interesting that miami corns and durango mtn kings from mexico look so much alike. I am not so sure that people are keeping "pure" animals so much as keeping what is in that area at the time. Snakes have been around a long time....seems like there could have been some genetic mixing in several thousands of years. I could be WAY off here but, seems like a plausible idea worth asking about.
Mike




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