You are so right. If you are able to take te time to read the body language of a Zon, then you will have a very fullfilling relationship with it. They will bring you love and comfort, yes comfort on bad days, they sense it, and will resort to just being quiet, being there with you, and cuddling when you need it. Not at all like a grey, on a bad day, they are usually close by and quiet.
Nilahdoes all the signs, eye pinning, tail flared, omitting her cologne, but no growl.....hisses like a snake only. She will step up when she is doing that if tell her too...good bird! But she does this behaviour when she is mad, guarding her cage, she is VERY protective over her cage, we are NEVER allowed to put our hand in her cage as far as she is concerned, or she will bite hard, doesn't stop me if I have to tho. she also does this behaviour when she is excited, and we have company and she is flirting with them.