My one and only silkie rooster for my 4 silkies, 3 barred rocks, and 1 Cochin, is -possibly- attacking my Cochin pullet. I say "attacking" with the possibility of it not being so bc I know nothing about chicken behaviors. So here's the scoop: I had the silkies and Cochin for about 1 week or so then I put 3 barred rocks in the same pen, 2 of which are now laying... He let the new girls know he was boss in only about 2 days, and has been fine/unagressive since then. The Cochin and silkies came together so I assume they already knew he was boss, I've never seen him "inform" them of his rank. Now I have seen him twice jump on the cochin's back and very, very aggressively (in my own humble and inexperienced opinion) yank on her neck feathers to the point where I seriously thought he was trying to break her neck... I smacked him off of her that second time bc it looked really painful and mean... She is just a pullet I am absolutely sure bc I haven't gotten a single bantam sized egg yet, so I feel like he's not trying to breed her... What is this behavior?