Thank you, I was so scared when I looked in on them and saw her there. I'm so glad she didn't try to leave from the top there, and glad she didn't get burned by the lamp, even with just a 50 watt night bulb it gets really hot. All I can think is that the cat maybe bumped the edge of it off and then bumped it back, he likes to watch them at night. I usually don't have my screen clips on but I will need to get them back on there. I will inspect it more thoroughly when I get home though, for today, the screen I put over the top will definitely keep all 3 of them in!