An orca cruises through a wintery fjord in northern Norway searching for herring. Each year orcas and other whales are attracted to the cold Arctic waters of Norway to feast on the bounty of herring in this area. It's one of the world's most spectacular marine migrations and feeding events that is also at risk. In recent years, the herring run moves location more frequently as the climate changes and waters warm, forcing the orcas to move with them.