Last year I got 3 red sex-links when I was just starting out with chickens. I come to find out this year that they are extremely aggressive. I have new babies outside in a penned in area where the red stars can see them and they stop at nothing until they get into their pen and are able to dominate them. I found the 2 month old babies hiding behind the dog house. I'm going to sell these three because I do not want to deal with those kind of issues but now I'm concerned that the other breeds I'm raising might be aggressive as well. I'm going to have Orpingtons, EE's, Wyandottes, Cochins, Welsummers and Faverolles. Are any of these breeds known for being aggressive or can I count on them to have good temperaments?