I am in the process of designing the permanent enclosure for my U. geyri and since I will be limited to 4' wide I was wondering if anyone had tried using a double height (say 4' tall) enclosure. I will be doing the entire inside with fake rock walls so figured I could make nice wide ramps up to the top section.
It would be much easier to control the tempature gradient with cool air intakes on the bottom level and a temperature controlled exhaust fan in the top level. It seems that it would be just as easy for a lizard to learn that the gradient is up and down instead of left and right and be able to thermoregulate just fine. You could still provide different areas of basking temps on each level, but I think the ambient air tempature gradient would be much easier to control this way.
I am thinking a MV bulb in the top and a 36" 5.0 flourescent in the bottom for UV and 50 watt halogen in the top and maybe some low voltage halogen spots in the bottom for small warm basking areas.
Am I missing something here? Other than I could build all this and my uro refuses to use one of the areas
I don't think he will have any problem getting to the top level as his current favorite activity is climbing straight up a cork bark tube I have set vertically, running down the ramp next to it then repeating the process over and over... crazy lizard 
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Mike Wilson






