Climate change pushing killer whales to migrate north The clear and calm waters of Reisafjorden, in Norway's Far North, have in recent years become the winter playground of the Scandinavian country's killer whale population. But climate change means both the predator and their prey must increasingly migrate further north, as the herring migrate towards the pole, leaving the Lofoten Islands in search of waters that remain under six degrees Celsius -- the temperature required for them to reproduce. IMAGES AND SOUNDBITES