I have a concern with two of my chickens. I'm noticing that my Rhode Island has lost a significant amount of feathers on the back of her neck. I'm starting to see the same thing with my Plymouth Rock. I'm not sure if this is molting or something a bit more serious. I know there's a cat that tries to sneak into our backyard, which we've had to scare away numerous of times. Maybe the cat tried to get to them? Or could is be something worse? parasites? diet? the other chickens picking out the other two? I'm just not sure. This is our first year owning chickens. We got ours back in February. We have 4 total. 2 Plymouths, 1 Rhode Island, and 1 Orpington Buff. They have free range of the backyard and are our babies. I'm pretty worried...if anyone can give me advice...I'd appreciate ANYTHING!