When the Sun starts to rise, you see flocks of birds flying out into the sunrise to start the day, feeding and moving around the refuge. Some days you see Egrets fly out 1 by 1, or if you are lucky you might see large flocks of Egrets or Cormorants going out in waves. Even with a high ISO, you still get a slight movement blur because of the lack of light. But it adds to the sense of the darkness of early morning and the movement of the birds.