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