My 8yr U2 does this beak "pecking" thing like a wood pecker on my wrist bone or any hard surface i.e. perch. Some times he regurgitates afterwards. He also puts holes in my clothes, esp. pants in the groin area. (BTW he is not biting me there.) He has bitten me a little, as a rescue I am still learning his behaviors. I know he was chased with a perch and hates any long object that a human carries. He was also left outside most of the day wings unclipped in a tree & dislikes going outside. I was surprised that he wasn't prey or didn't fly away. I love this site and have the utmost respect for the service that you do! PDKelly