I have a 3 year old buff orpington that is very lethargic, does not have any interest in food/water, and has a lot of clear discharge coming out of her nose (continuous drip). Overall she has been a healthy bird but she did have mites over this past summer which I treated her for immediately. Whatever is going on with her came on in a single day as she was out and about behaving normally yesterday. My birds are completely free all day and have a very large regularly cleaned coop so I don't think it would be air quality. I will call a vet tomorrow but in the meantime, input would be greatly appreciated.