Hi, Since yesterday, I noticed one of the silkies opened her mouth widely and shake her head frequently. Now a couple of those are doing the same. If open her mouth, it is very wet inside. They still eat fine and seems energetic as usual. I kind of remember seeing this symptom few weeks ago on one chicken, I thought she was thirsty, didn't pay much attention. Now seem more and more chickens are doing this... Any hint what is the problem? Will it go away by itself? How to treat it? If buy medicine, normally where do you get them..