The trigger for his screaming is loneliness, This is why he stops when he is with the budgies and starts up again when you take him away. So don't take him away.
If your budgies are tame, you can use that to show him you're not a threat. Spend as much time with the birds that you can possibly do. We spend between 4 to 6 hours each day with Henry and Angel. More if I'm not having to work.
If your budgies are tame, you can use that to show him you're not a threat. Spend as much time with the birds that you can possibly do. We spend between 4 to 6 hours each day with Henry and Angel. More if I'm not having to work.