How about D. No birds in a small area? Actually, this is my take on what she's doing. Hunting for moving leaves to pounce on. That seems to be her favorite thing besides birds. When it's real windy, she'll just stand there like she's pointing looking for leaves blown by the wind. Alot of maple leaves on the ground from this fall in that field. I was wondering what she was doing until she pounced on one.