At the Cardiff end towards Roath Dock, Song Thrush, 1 Oystercatcher on the environment building docking ramp, 1 Common Sandpiper across flew from the direction of the Norwegian Church onto the shore somewhere by the new path, juv GC Grebe playing hide & seek, quite a few Greenfinch which seem to like that end of the barrage. No Swift, and the Swift tower call system making a weird croaking noise so the repair not successful. Lots of Sand Martins at the Roath Dock nest holes. Count the resting Sand Martins in the twiggy bush – they like perching up there. I reckon there’s 18 or 19.