True, but this also implies that only specimens found within such an intergradation zone, actually qualify as intergrades.

The very moment an intergrade population becomes detached from the hybrid zone, it will follow it's own evolutionary course.

The Gulf Hammock Ratsnake, the Yuma Kingsnake, the Coastal Plains Milksnake, whether we recognize them as such or not, they are real enough for evolution.
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I'm Dutch. Somebody shoot me.

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