You know that thing where children and pets get more enjoyment out of the packaging than the thing you bought for them? I made some new cylinders for Rover when I redid the terrarium, then put him in and started cleaning up. He immediately started stalking (through the glass) the crumpled packing paper I had just picked up, so I gave him some. He has spent 80% of the time messing with the paper rather than exploring the new arrangement. Goofy!