Im so sorry, I am no expert of course, lol, But I bet he grows out of it fast It does just sound like he is being protective and testing his boundries, It says in the books I have read that they will go through stages like this.
Kinda like how some babies start to hit or smack people, You just have to say "NO" and they learn and grow out of it...Its like they just realized, He I can use these hands to get what I want, IN the birds case, "I can use these wings and this beak, Let just see what I can get away with!" haha
Keep us posted!