Adult Hawaiian Spinner Dolphin (Stenella longirostris) head-slapping (possibly to remove the remora attached to its chest?) in the AuAu Channel between Maui and Lanai, Hawaii, USA. Pacific Ocean.

hawaiian spinner dolphin stenella longirostris mammal porpoise delphinidae odontocete cetacea cetacean auau channel maui hawaii pacific ocean northern hemisphere sea marine oceanic water north america united states us one alone individual single solitary jumping leaping action active motion movement behaviour behavior