(I'm sorry I'm so critical!!!) I'd fill up those half-logs with scrunched paper towel, or spanish or sphagnum moss, or something. Babies like to be CLOSED IN!!! And maybe throw in a paper towel tube. I know it doesn't look natural, but they love them so much!! And, do you have a thermometer on the actual UTH, not just on the wall where is isn't that important??