The cliffs of this uninhabited island 1.5 miles (2.4 km) off the coast are home to a vast seabird colony of guillemots, razorbills, puffins, kittiwakes and fulmars. Several hundred arctic terns also nest on the island. Copinsay is also a good place to see migrant birds, with the best times to visit being mid April to early June and late August to early October. In autumn around 2,000 grey seals come ashore to pup. The island is mainly covered with grass, though there are good colonies of sea oyster and the rare oyster plant. Both have striking blue flowers. Information board by the pier building.