Just noticed this in the last week that one of my Black Star hens is keeping to herself, sometimes the only one inside our fenced-in pen while the others are roaming freely in the grass. A couple of days ago, she went into the fenced-in area as the others free-ranged in the yard, woods, etc. She pecks at scratch and dropped crumbles and drinks from the water device but doesn't do it in a 'frantic' scuttle like the rest of the flock (5 BS, 5 Columbia Wyandotte, 5 New Hampshire Red and one White Crested Black Poland rooster). When I went to see her, I noticed the dried white striated yellow poop stuck to her feathers. Thinking that her vent might be blocked, I used a soft cloth to remove the dried matter and then saw my first vent opening - which did not have any dried poop on it. There was some above it on her feathers so I washed that too. There were no feathers surrounding her vent in about a 3" diameter...is that normal? Anyway, tonight when I went down to close up the chicken pen and coop, all were roosting up high, mostly together and she was nested on the floor - never saw that before. I am extremely concerned that she is sick because she is definitely not acting like the others. Any advise for a new faux chicken farmer? Thanks.