"About in the ground, hmmmmmmmmmmm you do have it wrong. Which is why I questioned that graph. In my area, the desert southwest. Mass temps in the ground are pretty high. For instance, there is a cave by me at 6500ft elevation. Its 72F year around. Another closer to me that's at 4500 feet elevation. its 82F year around. I am at 2450 ft and its still hotter."

What part of Southwest you in FR? I'm guessing NM or AZ?

I'm not sure about how many snakes are in caves...I would think the temps in most caves are too cool for them to want to be there for very long...again I don't know one way or the other. My thoughts on this comes from the same way we cannot see much in a cave very far in so why would it be different for snakes...they are just as likely to get lost in a dark cave as we would. Now maybe just a bit in where they can see a bit of light, I'd say you'd find some. Temps would be warmer also near the entrance than interior.

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