Grey seals in Britain make up around 50% of the world population and are found mainly around the exposed rocky northern and western coasts, particularly uninhabited islands in the Hebrides and Orkney. Coming to sandbanks or sandy beaches, as at Donna Nook, is relatively unusual.
At Donna Nook breeding starts late in November. This compares with September in Wales and October in western Scotland. The pups are gone into the new year.