My first thought looking at that pic was Pituophis too, but the front half sure looks like burm (malnourished burm, but burm).

The apparent "blocky" pattern near the back could be real (burm patterns are pretty random and can occasionally end up looking very odd) or it may just be an "interference pattern" between a complex labyrinth and the square pixels of a digital photo too small to capture it...
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What goes up must come down...unless it exceeds escape velocity.

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