If he starts behaving like this we push him off and he flies away. He communicates his boundaries quite clearly by opening his beak (a warning before a peck), a

If he starts behaving like this we push him off and he flies away. He communicates his boundaries quite clearly by opening his beak (a warning before a peck), and we communicate ours by pushing him away. I should say that he generally behaves himself, but a little like a child, sometimes he is in "that mood" and is almost looks for trouble.