Often, but not always, a sick chicken is accosted by flock members. This is why a sick hen has an instinct to withdraw from the center of activity in the flock, usually retiring to the coop, a nest box, or a secluded corner.Just wondering. Why must the hen be separated from the flock? Is there anything about her that would cause them to pick at or aggravate/attack her?
The instinct of chickens is to try to drive out the sick member to preserve the health of the flock.