Many birds all for the blipping

On the way to Nelson blip mate and I called at the end of Headingly Lane Richmond where we had never been before. On the cycle trail round the Waimea Estuary, which I understand is the largest in the Southern Hemisphere , we could stand and see dozens of birds on the high tide. This is a sample. I used the sport setting to catch the welcome swallow.No wind, blue sky, not too hot-brilliant day.