Glad you found him and that he did not get out. I would have not thought of looking in the skull thats for sure! I would have freaked too. A few years back 2 of mine got out, I was freaking badly, the one was found 2 days later by my Dad in the kitchen cruising along the floor against the counter, Dad brought him to me and said "sweetheart, I found something you have been looking for", being half asleep I wondered why in the world Dad would bother me so early since we were on 2nd sift hours...so I open the door to find my Dad standing there with one of my escapees. I was still freaked out though cause I still had one gone, we tore the house apart every day for over a week, and about the time I gave up, thinking he got into the heater that was very old, like a radiator thing sitting in the floor of our living room that also had access once you get through the metal grate to the crawl space under the house, which had huge spaces, he showed up on the shelf just under his cage, by my pet mouse. So I can totally related to how any of you feel/have felt when your animals get out unintentionally.