A relatively quiet day on the corse. Early on a ringtail Hen Harrier shot down the corse and then, half an hour later, back up the hedge line. A Marsh Harrier was present throughout but kept mainly to the eastern end. I retired late morning to thaw out and, having done so, returned later in the afternoon - at which time 3 Whooper Swans flew in from the north and landed on the open water. They stayed for about an hour and a half before taking off to fly eastwards.