We have a flock of 14 hens and there were two roosters, one we gave to a local farmer because he was being super mean to my girls and then started getting sassy with me. Shortly after we got rid of him, Fred, our other rooster became withdrawn from the group and one day I came home and found him just sitting in the outside coop unable to walk and noticed he had blood up on his head. I picked him up to give him a little boost but he went right back down. I separated him from everyone else and the next day found him dead. I thought he may have been bullied by the girls, but not quite sure. Five days later, one of my very active, but large hens, Basil, is acting a bit odd...not jumping off the roost in the morning when I come out to open coop for food and water, she was kind of quiet for a day or two, and then today I noticed she was just sitting on coop floor and eyes were kind of drowsy. I separated her and now I'm thinking I may find her dead in the morning. I keep a very clean coop. We have had decreased egg laying, but the weather was really cold for a while (they stayed inside for 5 days), Fred died, we got rid of Rex AND my husband decided to bring in four more to the group...which caused a little stress, but they seem to all be ok now. So, there are so many variables, I don't know what it could be....Help...I can't bear to lose any more chickens!!!