This morning when I went out to feed, water and spend time with my birds, I noticed that my favorite little girl is sneezing and has a runny nose. She isn't constantly sneezing, the discharge is clear and she seems fine otherwise. She was (seemingly) fine last night when I checked on everyone for bed. The only other problem I've noticed with any of the chickens is an occasional bit of runny stool, but it's usually days that they've drank a lot of water, so I don't chalk that up to much. This is the first time I've seen any of them with a runny nose and they are just over 3 months old. They all seem to be perfectly happy and healthy birds with no other signs of illnesses or defects. Is there anything that I can or should do for her and/or the other birds?