I have a rooster who I raised from a small chick and who has always been very friendly. Over the last couple of month he has singled out and started picking on one of my older and favorite hens, "RED", who use to be the Queen of the roost. Yesterday I went to let the chickens out to free range and noticed RED now has a big, dime sized, hole in the back of her skull. The rooster is 2 years old and the hen is 3 years old but still laying regularly. None of the hens seem to bother her just the Roo - I'm not sure what to do. I try to keep them separated but when they are all out free ranging he always zero's in on Red, chases her down, mounts her, and then pens her down and pecks it her. Why is my friendly protective rooster turning into a monster? I hate to get rid of him but I might not have a choice. Any suggestions or thoughts???