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Humpback dolphin
Humpback dolphins are members of the genus ''Sousa''. These dolphins are characterized by the conspicuous humps and elongated dorsal fins found on the backs of adults of the species. They are found close to shore along the coast of West Africa (Atlantic species/variety) and right along the coast of the Indian Ocean from South Africa to Australia (Indo-Pacific species/varieties). A proposal by several institutions to divide the Indo-Pacific species into three distinct species of humpback dolphins has recently gained attention. One of the species would be the Indo-Pacific humpback, another would be the Chinese white dolphin and a new species, the Australian humpback dolphin, was described in 2014.
==Description==
The humpback dolphin is a coastal dolphin that can be found along the coast of Africa and India south to Australia, areas differing for separate varieties. The humpback dolphin has a hump ahead of the dorsal fin, as well as a careen on a ventral side. The dorsal fin of the humpback dolphin is to some degree falcate. The pectoral fins are considerably small and the tail flukes have a well-defined median notch. On each side of the jaw there are 30 to 34 small coned-shaped teeth. Newborn calves are a cream or pearl shade of white, much like that of an adult beluga whale, whereas the adults have a more dull off-white coloring from the tail to the snout. Their flanks are somewhat of a dark grey, and their stomachs are a lighter shade of grey. Adults can reach from and weigh in the range of .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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