I saw a product called AviCalm, it's for screaming, biting, plucking and such. It contains green tea and the product says that you cannot overdose by using it. I have a quaker that I adopted and she screams all day long. She is stressed because this is a new home and she does not play with toys. I have to wonder if this is his form of self entertainment, but the screaming becomes a bit much to handle lately. This is the loudest quaker I have ever met. Has anyone tried this product and if so, has it worked for you? I also found out that she is a chronic egg layer. thanks for any help you can give me.