There's a white sandbag and a cute little tray the size of a deck of cards or smaller... and we have a hamster. I also seem to have seen that a guinea pig can use it. That's why I deducted a star. Even a mouse is probably too small to go in and turn around because it has a tail. If our hamster gets in there, he'll probably get stuck and carry the lid like a turtle, so we removed the lid. He definitely uses it as a place to urinate without preparation. I was surprised. This is a great idea, maybe less messy cleaning.
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