The thing with areas like the ones occupied by Yuma's and Coastals, is that isolation by distance becomes part of the equation, resulting in phenotypes which are the result of natural selection, not intergradation.

When you breed a bunch of Coastal Plains Milksnakes from a certain location, you will probably end up with a lot of very similar looking hatchlings. Same story with the Yuma Kings.

Now this wouldn't be the case if the parents were collected at an actual hybrid zone, would it?
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