I have a Faverolle rooster who has seemed like he's had a cold for a few weeks. He sneezes every once in a while and shakes his head sometimes, a little runny nose, but other than that acts normal and looks normal. Just recently i noticed my serama/jap hen has awful congestion. I have seen her try to sneeze, but it's not often. The congestion is really bad, crackly and kind of wheezing when she breathes. I havent seen anything come out of her nose though. I have lost a lot of birds, but I dont think they were sick, they've just disappeared and it's got to be an owl or hawk or something. The only two chickens (above) that I have noticed are sick havent died or gone missing. Their color looks good, weight is fine, acting normal and happy. Eating well too. It has been anywhere from 70-80 during the day and it's starting to get 30 and below at night (GA). I feed them layer pellets and lots of treats - good treats. They are sort of free range but most dont go over an acre. Any ideas? The hen is really worrying me. I have brought her inside for the past week but she still has horrible congestion. Should i buy some antibiotics? Thanks for any help!!