Bird Watching Great South Wall Birding Dublin The Great South Wall starts at the old Poolbeg Power Station and runs for four kilometres out into Dublin Bay. Terns breed on a platform in the harbour during summer. It attracts divers in winter, including the Great Northern Diver. TealArctic TernTurnstoneCommon TernRock PippitDublinBlack GuillemotsWidgeonPied WagtailRoseate TernGreat Northern DiverGrey HeronSandwich TernKittiwakeTeal (Female)Black GuillemotSugarloaf DublinOystercatcherGuillemotHooded CrowCormorantBlack Headed GullCommon TernArctic TernHerring Gull 3rd YearRinged Common TernBlack Guillemot (Winter)DunlinGreat Northern DiversLesser Black-backed Gull