The noise these guys make is so annoying - a monotonous, eeeeee. They can keep it up for hours. The parent birds leave them in the trees around the house during the day for protection, I expect. I've been working in the garden and these two have preened each other alternately most of the morning - lovely to watch but the constant noise really gets to me. Still, the silence is golden once they decided to stop.
I think they have a secret between them as it seems that one is saying something to the other in the ear so that nobody can hear. They are lovely birds despite the annoyance of the shrieks.
