Very interesting topic, even so old, there is still not much of information. One new fact is, that Falcons has a lot in common with parrots. Have related DNA and if you start looking, it is visible how close some species are. Falcons supposed to have a lot more in common with parrots then with eagles and Hawks.
Question: did anyone try a faclonry hiode on a parrot? For the falcons this practice seems to work well and the bird likely does not care. Parrots on the other hand are quite different level of behavior in many aspects. I can only say, that once it is dark, the parrot calms down and goes to it's night time. G