A house for rats (or other rodents). DIY: 1. You'll need a closed X-ray box with a hole in one corner, a sharp knife and a glue gun. 2. Saw the box in half. Saw off the two large sides in the half without the hole in the corner. Maybe saw the hole in the corner a bit wider as well (I did that). 3. Glue the two sides on top as a roof. 4. Give it to your rats.