Well, not an RI. I didn't think it could be with everything stable, but you never know. He said you that it was the skin from his pre-shed that is giving him trouble. He plucked inside really carefully with these big ole magnifying glasses and low and behold it was a little flap of skin in each. Phewwww. Had me worried. No more mouth opening or clicking noises since. I'll keep an eye on him for awhile though, just in case.