One of my hens seems like she has a cold. She acts fine during the day, eating and drinking with the others, but she does sneeze occasionally and at night seems to be struggling with the breathing a little. She does have some snot coming out of her beak. I know there is a proper name for those little holes but I can't remember it. I noticed one of my other hens is sneezing a little too. The first hen has been sneezing for awhile but I just noticed the breathing lately. We have a bird vet in the area but I really don't want to pay for the vet if I don't have to. Do I have to have a prescription to get medicine for my chickens? Any advice or suggestions would be greatly appreciated.