Someone mentioned clumsy ball pythons, and you shouldn't have anything too high for them to climb on because they fall. I have a climbing branch, but Norbert rarely uses it. Instead he works his way up the side of the rubbermaid to the top and squeezes himself into the small space between the rim of the rubbermaid and the lid. There's about 1/2 inch to 3/4 inch of space there. It's kinda hard to explain, I'll try to take a picture next time he does it. He's trying to get out I'm sure. I have it secured very well, so I know he can't get out, but he keeps falling down from there! It scares the heck out of me. I'll hear a thump, or sometimes I actually see him fall, and he looks okay afterward, but I'm scared he might hurt himself. The rubbermaid is about 13 inches high. Should I get a different container where he can't work himself into a space up there?