Normal is relative, in that within a range there are differences within a population from valley to valley in the wild as in the rosy boa the color varies from one small area to the next. Sub-ocs are found in a blond phase Between Terlingua and Lajitas so beauty is in the eye of the beholder.
If you want to muddy the water some more there are natural intergrade zones, so what now? If I find an animal in an intergrade zone it is a mutt? Hmmm guess again to each his own. At the end of the day I like it,
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