I've read through quite a few of the "clicking" posts and haven't seen one with the same question/observation as me. Today I noticed Mikey making clicking sounds. It didn't happen with his mouth closed or while eating. He would just open his mouth and it looked like he was using his tongue to click. Is it some form of communication or possibly a tiny bit of food stuck to the roof of his mouth? I didn't see food but I also didn't try to pry his mouth open to see if something was up in there.