Sometimes it’s the fishing boats that look for the killer whales and humpbacks, hoping to locate the shoals of herring that migrate to these Arctic Norwegian waters. But in recent winters, the whales have also started to follow the boats. Here a large male killer whale feeds on herring that have been squeezed out of the boat’s closing fishing net. He has learnt the sound that this type of boat makes when it retrieves its gear and homed in on it. The relationship would seem to be a win-win one, but not always.