I know my two little Roborvskis Machu and Pichu are using their sand box to go wee. Im not sure how much they use it or if they just happened to wee in there when they are sitting and digging around in it. I havent found and "wet corners" yet. But with about an inch of carefresh bedding and considering how small they are, I doubt any of their urine would reach the bottom. :P
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