Oh we know plenty on how tricky cats are with cages! I've lost a few hamsters and a budgie and some finches to cats before. She has lid clips on her cage both so she can't escape and so the cats can't open it. Her cage is also ontop of iggy's and my ceilings are at an angle so there's no room for the cats to get on top of it (plus it keeps Iggy from pushing the lids off his cage and escaping! [actually he just sits on top of the one lid next to the heat lamp but still] But might get him this nice 40 gal atrium tonight which has a better lid)

That and since my budgie's in my room, only 4 of the cats are trusted to even be in here, and all are supervised while in the room. No animals come out of the cages if the cats are in here! Door is always closed to keep those brats from getting in here.