It ssems some have been told about excessive screaming in feeding weaning birds. I've been with a breeder for hours before & after feeding & f birds from green cheeks, tiels IRN & eclectus & never has it been .excessive. I agree that from the vids he is communicating & you are answering all the calls so he is doing it more & more. I think he thinks you like it. This may be loud but its not screaming its communicating in a begging mode. Birds think when you react to a sound or action its good as they have your attention. They don't understand why someone would give attention or talk to them when they did something or screamed except to think...Wow...it got me attention so I'll do it again. If you don't like a sound the best thing is to ignore it. If it stops you from moving etc... its been reinforced & he has his reward. My only concern is he had crop or intestinal or some discomfort but otherwise you are going to have to watch him quietly & only respond with voice or body actions to nice sounds or quiet sounds & good behavior. TAt this point & in most times in a birds life No means yes..