I have an 8 week old Buff Orp x Araucauna pullet that I bought with three others at a poultry swap a week and a half ago. The day after I brought them home, all of their butts/vents appeared to be wet. Today, I have only one that still has a wet butt- the others have all cleared up. I have looked for diarrhea and worms, but the poop appears normal. She is eating and does not act sick, but is a little smaller than the others. Any suggestions on what might be the problem? It appears to be something they all had, but most have recovered from. I'd like to identify this and control it long before I need to put these in with the rest of my girls. Thanks for your help!