They will sometimes rest on their back for a while (could be a long while, patience is key with these creatures) before they "pop their top" so to speak.My tarantula went through about a week of the described sequence of not eating, not moving, the bald spot but I couldn't really tell if he was on his back or stomach. Now he is definitely on his back so I thought he might be molting but the posts all talk about a matter of hours. He has been like that all day without moving. Could he still be molting? Is there any movement when they molt?