Barra starts off at Murlough National Nature Reserve near Dundrum where he meets ranger Barry Crawford. The dunes here are rich in wildlife but it's a group of Exmoor ponies that keep them in top condition by cropping the grass short.
Barra then travels to Castlewellan Forest Park where his fitness is put to the test on an uphill cycle. Then it's on to Greenore, on the shores of Carlingford Lough, to monitor a bottlenose dolphin.
