I had 2 RI Reds and 2 Black Australorps that were raised together from day-olds. (All pullets.) (This picture still gets me teary-eyed ) Two died after my dachshund, which had also attacked my pitbull puppy and killed my pet duck, decided to break their necks while they were sunning outside one day. (I rehomed the dachshund to a loving stay-at-home mom and her 3 kids who adore him...we have had no chicken deaths since with my other 4 dogs.) My remaining RI Red and Black Australorp act like a pair at 2 1/2 months old. They sleep on top of each other with their necks overlapping, preen each other, and freak out if they are removed from one another. They invited the Easter Egger chicken to join them, and they are usually a trio now. However, I added a NH Red, and another 2 1/2 month old Black Australorp to join them. The Easter Egger hates them passionately, and the RI Red and the other Black Australorp want NOTHING to do with them. Will this pass over time or will the ladies always hold a grudge?