Hi Bob, actually they pick these areas in nature by feel. And by mass temps.

For instance, there are millions of those cracks, yet they only use a few that are very very similar to eachother. In feel. in thickness, etc.

Thickness allows for an even change in temperature. That is, it will not cool to quickly or heat up to quickly.

In a cage, that does not matter, but feel does.

Something for you to think about. I have a husbandry tool with varanids that was named by others, RETES stacks. Its a stack of wood to duplicate different layers with different temps. Its famous in the varanid world. I say that because I developed it for pyros. Its really fun to see them work it.

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