Make a "pinata" for your rattie with a small box and some tissue paper. Put treats inside the box and close the box, cover the box with tissue paper (children's school glue is safe for use). If you also put a small bell in the pinata box you will hear the bell ring when they are playing with and opening their treat box. This is great fun for the ratties. If you use a box big enough for them to sleep in, they will.
In the high plains of South Dakota, USA