I had two indoor cats (with clean litter boxes) that used the dirt in my box turtle enclosures as a litterbox. They didn't care about bothering the turtles but did go potty in their enclosure and covered it up. They were never outdoors in their life. Interestingly enough, when it came to my lizards it was dependent on the lizard. My blue tongued skink, larger size and slow moving, was never bothered by my cats. But smaller lizards, like my leopard geckos, were a snack to them. A bearded dragon, jerkier in movement than the blue tongued skink, also excited the prey drive.I have had cats all my life and I am old as dirt. I have never seen or heard of any cat using a damp substrate as a litter box, especially if their own is clean. There's always something new to learn, and possibly because I don't believe in outside cats and always have inside cats mine and some others I know of are different. I know I can't trust my one cat around my birds, but neither really cares about my tortoises. I will remember what you have said, and make my comments about cats and tortoises more personal to my own...thanks for your input.
Btw, I'm loving the idea of the bottom bunk for an enclosure!! However, I agree with the others. It needs more "stuff". Too much open space and not enough cover for security. Cork bark, plants (fake are fine), half logs, etc. Great idea though!
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