Hello everyone. I am new to the forums here, and to chicken raising. We have had our backyard flock for almost a year now. About 5 days ago our favorite chicken (Rosa, a blue Cochin) became ill. She was sitting around in the coop, wouldn't come out, and didn't want any treats. I took her inside and made a nice cozy spot for her in a storage tub. I put water in there and she drank. She stayed in there all day, but seemed to get worse. By 7 that night, she had died! I was worried, so I changed the bedding in the coop, and washed their waterer. Today we went out to find one of our Light Sussex hens dead in the coop! We have no idea what is going on or what to do. We have 5 chickens left, and I don't want them all to die. Does anyone know what it could be?? I would so appreciate some help! Thanks!