I have a small flock of Icelandic chickens who run loose in the yard and are semi-feral. That means, they hang around because I feed them, but they act wild otherwise. Since they roost in a tree higher than I can reach, it’s very hard to catch them. I had just put dog food down in the kennel for my livestock guardian dogs, leaving the door open, and of course the chickens spotted it and were in there ahead of the dogs - they are allowed to clean up what the dogs leave, but the dogs need to get what they want first. So I went to chase the birds out, and noticed that the roo that was in there has very rattley breathing, like someone very congested from a chest cold. Suggestions on what that might be? I can do research but need something to look up. It was just the one bird. None of the others sounded off. And he looks fine otherwise.