Indian Ocean humpback dolphin

The Indian Ocean humpback dolphin (Sousa plumbea) is a member of the Delphinidae family living in coastal areas from Southern Africa to Western Indochina, including East Africa, the Middle East and India. The Indo-Pacific humpback dolphin was formerly included in the same species, but a 2014 study showed the two to be separate. Most animals stay in water shallower than 20 metres, and the species has been reported in nearly every type of coastal habitat. It is a medium-sized dolphin 2 to 2.8 metres long and 150 to 200 kilograms in weight, with a fatty hump on the back that distinguishes it from Sousa chinensis, which has a more prominent dorsal fin but no hump. Groups average about twelve animals, and the largest observed exceed 100. Most of its diet is sciaenid fishes, cephalopods and crustaceans. Chemical pollution appears to be the most important threat to it, alongside by-catch, vessel strikes and noise, and the species is currently categorized as Endangered. Important populations live along the coasts of Oman and the United Arab Emirates and in Menai Bay in Tanzania.