This little Pied Wagtail (Motacilla alba), is very difficult to see on a stoney beach and could be another pebble until it moves. I followed this one as it ran along the shoreline. It hopped on the odd, larger stone as if to get a better vantage point or just to rest.
Pied Wagtail (Motacilla alba), West Shore Beach, Llandudno, Wales. April 2017.