A day or so ago, when I went to move my Silkie trio from their inside cage out to the outside pen, one of the hens regurgitated all over the place when I picked her up. I also noticed that she is making a wheezing, gurgling noise when she breathes. She has been looking ok, otherwise, I didn't notice her looking sick, before this, but this concerns me. She did it again today when I moved them, too. Can anyone tell me what it could be? I'd like to start treating her before she gets worse and/or spreads it to my other birds.