Hello. We have two Australorp chickens who are a part of our initial flock of 5 (which also includes a Rhode Island Red, Golden Comet, and Leghorn). We’ve recently introduced three new chickens (Brahma) who are now roughly 2 months old to the older group. All of the chickens from the initial group, except one, are being reasonably accepting of the new chickens - chasing them around a bit, but generally being friendly. The one exception is one of our Australoop chickens who is being VERY aggressive and has given us the impression they might even kill the newer chickens if left alone for too long. We’re not sure what to do - and haven’t fully integrated the two groups due to this issue. Suggestions?