A busy day meant that today's walk had to be delayed until 7pm. Conditions were far from ideal with light rain and failing light. However a House Martin over Moulin playing fields was a first for the year. Nearby, a Grey Wagtail was singing as it picked over some floating debris on the river. I have seen this behaviour once before - on the strand line in Troon. Both birds seemed completely engrossed in searching for food, but were still able to sing a really quite complex and sustained song.