The number of mutilated Hectorâs and Mauiâs dolphins found on New Zealandâs coastline has more than tripled in the past three decades, Department of Conservation statistics show. There were five cases from the 1980s, 14 from the 1990s and 17 since 2000. Mutilations included: bellies slit open, heads/tails/tail flukes/fins cut off, filleted, gutted. Hectorâs dolphins are an endangered species and Mauiâs dolphins are critically endangered with just 111 individuals left. The government announced measures to protect Hectorâs and Mauiâs dolphins in mid 2008.