I am new to any chicken forums. We have had chickens for about 5 years and had an animal kill off some of our chickens, but I have never had any die from what I think is some kind of sickness. A couple of weeks ago I noticed one of our 5 Comet chickens was losing her feathers. I figured maybe she was molting. Another one of the chickens sat pretty still in the Sun, but when I went to check on her she rambled around fine. They all were eating and acting normally. I went away for the last week while my family took care of the animals. While I was away 3 out of 5 of my Comets died and I have one currently that I am keeping in the house that looks like the one that I thought was molting. Currently, all the other chickens look and act fine, even the one Comet that is not in the house. One of the 3 that died was eaten by a raccoon (I assume), but I do not know if it was sick before that. One that died right before I came home they brought in the house. It did not want to eat and died later that day. That one did not look like it was molting. Is there anything I can do to help save this chicken? Should I be contacting someone to rule out some strange disease? What can I do to help them?