The Manx shearwaters return to the islands in midMarch and the last fledglings have left by the end of September. Choughs may be seen around the area all the year round, a popular spot is the Deer Park by Martin's Haven. Boat trips are available from Martin's Haven near Marloes to the nearby islands. There are trips to and around Skomer Island (some landing), to Skokholm (non-landing) and to Grassholm Island (non-landing). Gannets are seen in great numbers diving for fish around Grassholm Island. Grey seals may be seen all through the year. The white seal pups start arriving in mid August and in greater numbers through September and October. Porpoises and dolphins may sometimes be seen.