Scooter the CAG is a very polite parrot. Every time I give her a treat, she takes a little bow before accepting her treat, as if to thank me for giving her the treat. It's an endearing gesture. I wonder if it's something Greys typically do. George the YCA used to greet me sometimes with a little bow and wing-lift, and Ralph the QP sometimes does something similar to show that he's happy to see me, but Scooter is the only parrot I know (so far) that bows before accepting a treat.