Iolo goes by boat to Ynys Badrig, an offshore island which is the northernmost point of Anglesey and Wales, and the potential site of a new gannet colony. He explores a stunning wood at the centre of Anglesey, with carpets of spring flowers and native red squirrels. He watches peregrines on the Menai Strait, and on wetlands near RAF Valley, he finds nesting sand martins, spots otters and has a rare sighting of a bittern.