Warning: this video contains graphic images which may distress some viewers. Animal rights activists have begun a legal fight to try and stop the practice of dolphin hunting in the Japanese town of Taiji. The lawsuit argues that dolphins are wrongly categorised as ‘fish’ in Japan when they are biological mammals, which are protected from cruelty under Japanese law. The fishing town has been at the centre of international attention since the release of a 2009 documentary The Cove.