Hi. I am trying to figure out why a leghorn roo(he is huge) born at the same time (all 5 are 4 months old) is now trying to kill this bird. They all got along fine for 3 1/2 months. It is supposed to be pullet, but I think it may be a roo. All our other hens are not nice to him either. He sits on the back deck and is afraid of everything. Tried to put him in one of our other coops last eve and those 8 kept pecking him too. What the heck.