Mourning doves were not common in Nova Scotia until a few years ago. I wanted to photo one in flight because of the near-white pattern on the tail feathers. Doves are very skitish, timid birds. The beep of the auto-focus seemed to interest the bird. I kept my face hidden behind the camera, moving close, taking photos so the beep would keep repeating. This worked until I lowered my vision to check my footing on the steep downhill grade. The second I did, the bird was gone.