I have a group of six chicks that are 4 weeks old. All were fine and normal last night before I began to relocate them from the brooder box to the brooder pen. I placed all six in a dog carrier (plenty of room for them) for the move. They were in there just a few minutes during the walk. When I placed them in the pen, I noticed one with her head buried in the wood shavings acting like an ostrich. I gently lifted her head which she seemed to tolerate, and she would leave her head up for a minute, then go back to playing ostrich. She would also keep her left eye closed sometimes but I didn't see any injury or foreign substance. I held her for awhile encouraging her to keep her head up and I stroked her chest in case she was trying to get to something there that was bothering her. She eventually calmed down and kept her head up so I placed her in the pen where she seemed okay. This morning I went out to check on her and she was doing the same thing, tucking her head down under herself. I had to leave for work so I don't know how she is at the moment. Does anyone know what might be going on with her or what I can do to help her?