actually no. They're non spontaneous ratties I guess. Even when we just had the little cage with the first two we would keep the door open all the time. Now with the big cage, they just look over the edge, then play with the blinds a little bit then go into the house on top. Now Seva did fall from the little drawer thing (the one that says RATS with the red line through it) to the floor and I looked and he just crawled up the side of the cage and went inside. That was the only kamikaze event. TRUST me, this is so new, I've been watching them....they don't seem to want to get out. Actually I close the main cage when we leave and when we're sleeping, but theres always the hole to get to the top..they hardly ever run to get out anymore...I guess they think they can do it all the time.