As you can see from the photos, he dug his claws into the plastic liner we have (to protect the wooden table from mold and such) and climbed up the corner of the walls and fell out twice. Luckily, the floor is carpeted and we got home in time to help him up -- he's just fine now. (I looked him over like the good mother I usually am.) We ran to the hardware store today and picked up a few pieces of wood to create a lip around the enclosure so he can't get over that now. In the first photo, you can see a textbook we had put over the corner but he was able to push that out of the way and still climb out! In the third photo, he tried to climb up again but with the wood on top of the walls, he had no where to go but back down. Success! But geez, what a little (horny) climber! He still has his log hides to climb over, which he has been doing quite a lot of lately! XD