My baby got out the other night. I tell you I FREAKED out. Especially because I have cats, soooo I was crying thinking I was about to find a dead bloody skeleton somewhere in my closet. The cat's had knocked something heavy on top of the cage, and it broke through the top. Skittles (my ball) climbed up it and right into the back corner of the top shelf. I was glad I found him in one piece let me tell you! But needless to say, I don't let the cats roam around the tank anymore.