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Ribbon seal
The ribbon seal (''Histriophoca fasciata'') is a medium-sized pinniped from the true seal family (Phocidae). A seasonally ice-bound species, it is found in the Arctic and Subarctic regions of the North Pacific Ocean, notably in the Bering Sea and Sea of Okhotsk. It is distinguished by its striking coloration, with two wide white strips and two circles against dark brown or black fur.
It is the only living species in the genus ''Histriophoca'',〔 although a possible fossil species, Histriophoca' alekseevi'', has been described from the Miocene of Moldova.
==Description==
Adult seals are recognizable by their black skin, which carries four white markings: a strip around the neck, one around the tail and a circular marking on each body side,〔Peter Saundry. 2010. (Ribbon seal ). Encyclopedia of Earth. C.Michael Hogan (Topic Editor). Cutler J. Cleveland, ed. National Council for Science and the Environment, Washington DC〕 which encloses the front fins. The contrast is particularly strong with the males, while with females the difference in color between bright and dark portions is often less conspicuous. Newborn ribbon seal pups have white natal fur. After moulting their natal fur, their color changes to blue-grey on their backs and silvery beneath; after some years some portions become darker and others brighter, and only at the age of four years does the typical pattern emerge.
The ribbon seal has a large inflatable air sac that is connected to the trachea and extends on the right side over the ribs. It is larger in males than in females, and it is thought that it is used to produce underwater vocalizations, perhaps for attracting a mate. The ribbon seal can grow about long, weighing in both sexes.
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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