The highest recorded cockatiel screech is 123db so I have read, My lawnmower is 98db. I reckon Peppy's is well over 100db. I think it is a female thing. People suggest it is boredom or lack of stimulation that causes it but I don't believe that. She is out and has company all day and toys etc and is worse in the morning. This is combined with non-stop room circuits for hours on end.At least she is ready for bed by 7pm.