Jen, I put in tp tubes, as well as paper towel tubes, and they are instantly gone! Chip is the runner on the wheel, and Dale is the digger and tube shredder. Dale is much more friendly, while Chip startles easily. It's neat watching them and learning their personalities, likes, and dislikes. I'm going to try them on some veggies and fruits. My hammy loved the greens, these guys seem a little more hesitant. I'll try a very small amount at first and see what happens. Looks like they are going pee on the wood shelf, I'm wondering if I should make a fleece liner for that...so it can be changed...? Don't know if they would chew on the fabric, though....