Salzedo just started doing that. His DOB is Sept/22/2007 and he is growing like a weed. I plan to pick up new hides at an upcoming reptile expo, although I know that some snakes prefer the smaller ones and don't mind 'popping' out of the sides. A friend of mind had a large snake (forget the species) who'd refuse to use the new hides, so she'd curl up into a big ball with this little hide just covering her head. Salzedo has also recently started moving the hides around while he is inside. Maybe he dreams of being a turtle?