Last night around 7 pm (18 Sept), one of my 7.5 month-old Buff Orpingtons was standing alone, staring off into space, when I went to the run to give everyone their scratch. The other 8 chickens (2 buff orpingtons, 2 rhode island reds, 2 silver laced wynadottes, and 2 easter eggers) were normal...
