I have three rats and recently one of them (or all of them, I'm not sure) has started using the top level of his cage as his new bathroom and it's driving me crazy. They used to keep to one corner of the bottom of their cage, and were very neat, and now one of them isn't anymore and the smell carries and it's awful =(
I don't know why he is doing this, I'm not sure what the problem could be. I clean their cage regularly (this happens even when I freshly change their bedding). Their cage is large and roomy, and I can't really see what the problem is.
What do I do? Why are they doing this?
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