This morning I opened the door to the run to let the girls free-range. Typically they all go charging out at top speed. This morning, most did this, but 3 stayed behind and were at the back "wall" of the run, packing back-and-forth frenetically, vocalizing (not loudly), and running their beaks along the hardware cloth. They kept this up for a good 5-10 minutes. Finally 2 exited and went back to normal chicken behavior. The last one kept it up. So I got close, she ducked close to the ground like the laying hens often do, I picked her up and put her down by the door. She then ran out the door and started free-ranging as if nothing had happened. It was so weird. Anyone have any idea what this was about?? While it was happening, the others were happily free-ranging in the yard.