One of my buff orpington chickens seems to have some sort of respiratory thing going on. She came near me and I thought she was very talkative because she was making a lot of sounds. These sounds were similar to the girls' curious, little purring-type noises that they make when they think I have treats. But then I noticed the sounds were with every breath -- both in and out. So it's really more that she's wheezing, I guess. Then, she had a sneezing fit or possibly coughs with about 4 sneezes in a row. None of my other chickens have been sick the whole year that I've had them. They just had their first birthday on the 6th. Any ideas on what's going on and what I should do about it? Thanks!