HELP my chickens get the more "unfriendly" the older they become. They are now 4 weeks. They're not mean in anyway, they just don't want to be held anymore and scream bloody murder when I corner one to pick it up. I only do it so they stay used to it. Once I pick them up they seem okay but can't get away fast enough. Is it because they are sex links and not true breeds? Is it possible they will calm down and change? I spend alot of time around them and so does my son, but we just want to be able to hold them. We've tried at night too and they wake right up and freak out as usual.