Travels and other things

I'm not sure I like the fact that my roomate likes to walk around the ceiling, but I know he is only trying to help keep the insect population down. He seems to like to rest under the wood that goes around the top of the wall. I also saw two of his buddies go behind a bookcase in the corner, when I moved the bookcase, I saw a mouse-like hole in the corner by the floor where they are coming and going. So far I'm up to 4 different lizards, from about 3 inches to 6 inches, and that's when the lights are on. Who knows what kind of parties they throw after dark.