This isn't really a problem or anything (I hope), more just me being curious, but my caique Wyatt throws tantrums when things don't go his way-- such as me telling him 'no' for something he really wants to do, his toys falling over when he is trying to stack them, or when he accidentally drops a treat and can't get to it. He throws himself down like a toddler in a supermarket and cracks it, making angry gibbering noises as he holds the 'wrist' of his wing while flapping it, which is something that he's always done but is still pretty odd. Aside from a little extra wear on his feathers (like the sort that can happen from wearing a harness), there's no damage there and it doesn't seem to be a compulsive action as the second he finds a distraction it's back to business as usual (these tantrums are very short-lived, thankfully), but I'm curious as to what your thoughts on this might be?