Cave’s Marsh Bird Watching Dublin Caves Marsh is a marshy area near Swords sailing club. It is part of Broadmeadows Estuary, one of the most important bird watching locations in Dublin. Cave's MarshCommon GullGrey HeronDunnockCaveMarsh (1)StarlingRed Breasted MerganserBlack Headed GullMute SwanCarrion CrowBeware of the Gull!RedshankBlackbird - FemaleBlackbird - MaleHerring GullOystercatcherMallardBrent GeeseCaveMarsh (19)Hooded CrowGoldeneye