I have 5 chickens and 3 ducks. 1 chicken has been sneezing frequently for 2 weeks. None of the other chickens or ducks are sneezing at all. She has no external parasites (I checked), no nasal discharge, lively behavior, good appetite and coop is regularly cleaned. Her comb is a little floppy but has good color and her eyes are clear but she sounds snotty. In well ventilated coop at night and roams yard during the day. Fresh water 3x a day and fresh food placed out 2x a day. I attached a picture. 1st time chicken owner and probably just nervous. Any ideas, comments or suggestions? She has sneezed twice while I was typing this. I also attached a pic of my ducks just because I could.