I cut a hole in a small cardboard box and sat the box upside down over top of a heating pad in the livingroom. Next to the heating pad I have a bowl of water and a 2 liter pop bottle (I cut the top off and placed it on backwards) with 2 baby rats inside. I was debating putting the pop bottle on top of the heating pad, but I figured that would start to stink up my livingroom. We'll see how this works, I hope she turns up.