This week, Colin visits some old friends at their farm on the outskirts of Dublin, where a trail of shredded milk cartons leads him to an extremely resourceful family of urban foxes. From there it’s off to county Limerick, where, at a weir underneath an old road bridge, he comes face to face with one of Ireland’s most ancient and, some would say, terrifying species – the sea-lamprey: a bizarre, prehistoric vampire fish. Colin also meets John Tiernan a Mayo farmer who has adapted his entire approach to farming to suit a migratory corncrake he has heard but never seen. Together, the two travel to Tory Island in the hope of catching a glimpse of the country’s most elusive bird.