I have a 21 week old buff orpington who I found this morning with a neck twisted to the side and if she tries to move it, it just shakes uncontrollably. I found her this am when I opened their coop up for the day. On Sunday morning, we had another situation where a buff, same age, was found laying down with no control over her head. Beak was up, eyes down. She was still alived, but couldn't move her head. Any thoughts as to what this may be? Neither have visible wounds.