Good luck with the search, I hope you are successful, I'll be interested in seeing those.
I agree with your thoughts on the limestone transition zone, and attribute the greater variability of the Boy Scout animals outside the canyon section of the road to this feature. The three snakes in my previous post come from an area like you described. For the foreseeable future, I will be spending a good amount of time looking on a ranch near Shafter that has Cibolo Creek running through a transition zone of limestone and volcanic rock.

Another from that same section of road.

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