Hi Daryn, Tort lodge was designed with a a double layer which is insulated, though I had it made of wood. Like you have said, the sole purpose was so my torts could dig down and hibernate safely without the use of a fridge or box. It is very successful if the pre and post hibernation is managed properly and a lovely way to hibernate and I think a lot less stressful for keepers and torts. I should think that if everything is properly secure rats would not be a problem.
Underground is lined with breeze blocks, 2inches thick insulation blocks and pond liner...... It would take a super rat to get through that!!! X x x. Hugs x x x
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