 Two endemic , distinctive types of pilot whale , Tappanaga ( or Shiogondou ) the larger , northern type and Magondou the smaller , southern type , can be found along the Japanese archipelago where distributions of these two types mostly do not overlap by the oceanic front border around the easternmost point of Honshu . It is thought that the local extinction of long @-@ finned pilot whales in the North Pacific in the 12th century could have triggered the appearance of Tappanaga , causing short @-@ finned pilot whales to colonize the colder ranges of the long @-@ finned variant . 
