YWG went missing. He's never gone into hiding like this. He's always been visible and out. I took the lid off to do some cleaning and now he's missing. I'm afraid he jumped but there's no sign of him. My cat is always near but I feel like I would have noticed him messing with it if he found it on the floor. It's been only 12 hours but I haven't seen him and he didn't come out to feed.

Any clue?