I have 5 black australorp hens, 2 Isa Brown hens, 1 white leghorn hen, and 1 amberlinks hen in my flock. 4 of my black australorp hens are missing feathers on their necks and butt area. It's been several months and I can start to see new feathers coming in, but do you think this is feather pecking? Why would it be just the 4 black ones and no one else? I have observed them closely and haven't seen any feather pecking. I wouldnt even know who to separate from the flock if it was feather pecking.. Can you look at the pics and tell me if it looks like feather pecking and what I can do to help them? No one else in the flock is having this issue and the 4 that have it all have varying degrees of severity, the one pictured is the worst one. Thank you.