My 16yr old male cockatiel has had noticable dropping changes during the past week and a half. I notice that he is pooping much less than normal although when he poops, the dropping appear to be mostly normal with some being pretty big. He goes for hours without pooping now and its not typical of him. His diet is mostly harrisons lifetime pellets, he never eats seeds or anything else. Behaviour wise he is like his normal self but evidently I think he is constipated? Have you guys experienced this?