in a book about parrots i read about their body language and here is just some interesting information and if anyone else knows any other parrot body language then please add.
tail wagging
the parrot is just saying "im glad to see you" or "that was interesting" but it can also be a giggle
streching
"see how glad i am to see you?" an appropriate response is to mimic the bird and they will understand it as "yes you are very pretty i am very glad to see you"
preening
"i want to look nice for you!!!"
allopreening
"i like you, i want you to look nice for me"
bird scraching its own neck,chin or head
it is an invitation for you to pet the bird. its just like saying "i am so lonely, i have to scrach my own head:("
facial feathers fluffed over beak
(usually done by cockatoos)the parrot is trying to be cute and saying "im so sweet i dont even have a beak"
beak grinding
this behavior says "im going to sleep now" a normal healthy parrot does this but a ill or a depressed parrot will not do this.
tongue wiggling
in human terms this s an affectionexpresion saying "i like it " or i like you