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Originally Posted by WingedWolf
I think it's a grey rat snake. The picture's too blurry to make out real details. I don't suppose you know how long that shepard's crook holding the birdfeeder is? What little I can see of the markings suggests rat snake more than boa, too. Grey rats are pretty variable in their pattern. Dragon, what makes you say intergrade, looking at the film? (curious)
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I'm guess intergrade because there is such a stark contrast between the belly (which looks almost bright white) against it's lateral coloring, plus the darkness of the blotches on it's back and sides. The grey rats I've seen are closer to a light to medium grey on their bellies, and black rats bellies and chins are typically bright white. They do overlap in range, and have been known to intergrade.
You are right that they are extremely variable though, and I could be wrong, but that's my best guess.