Thigmotropic refers to the preference some species of snakes have to being in a space where they press their bodies up against a solid surface. (p. 129, The complete Suboc, Rhoades. Took a while to find that term in the book. For all you young budding herpetologists who will be scientifically oriented books - include a damn index!)
I can only speak for my snakes (all North American species), but they use their hides much of the time, and prefer them on the small side. The Sonoran gopher jams herself into a tupperware that would seem entirely too small, but that one is always her first choice.
I would add hides even in a rack system. YMMV.
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