He was just sitting on the top of the door (it was open); not quite sitting straight up. He had been slightly less active the previous day also. We got in to see our avian vet the next day. The dr gave him a thorough exam, and thought it sounded like it might have been gastro distress of some sort -- took a blood sample and sent it out. He told us to put Sir Calahad on a strict pellet diet for a week or two and see if that helped. We had been giving him some vegetables at supper time - a mix of vegetables. He gave us a probiotic to give Sir Calahad, once a day for 3 days, then once or twice a wk for maintanence. Blood work came back with a slightly low potassium level (he had a lower level 6 months ago when his yearly blood work was done - so it had improved slightly). After a week, Sir Calahad was more active - more like his normal self. Now, after 2 weeks, he seems to be his old self. Talked to the vet, and he suggested adding just one of the vegetables for a week to 10 days and see how he reacts.