Hey guys. My cockatiel started acting weird lately, He is napping most of the day (but that's probably because he wasn't getting enough sleep lately) and now he is suddenly territorial ! He was sitting in the corner of the cage raising his tale like if he was in attack position and when i put my hand in the cage he literally attacked my hand like a fighter jet lol. Also he is not as interested in food as he used to be. He is now about 18 months old, What's up with him?