With cage in middle of room they will stay on or near their home, however rats by nature dont like open spaces, now put them next to a wall and they will scuttle along the skirting board with more confidence, we left ours out ( under supervision of course ) and never lost one, they are rather greedy and their stomachs rule their heart, as they have poor sight their nose always tells them when a tasty treat is available, and always came back to you,