Help! Have small mixed flock of 12 hens and 1 Roo. 2 hens in the last 3/4 days have started rattling/wheezing breathing. Started in 1 first and then today noticed it in second hen. It sounds awful. I'm new (6months) into raising hens so I only know what I read on here. I took a video of her breathing but can't figure out how to attach a video. Any help or advice is appreciated greatly.