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Steller sea lion
The Steller sea lion (''Eumetopias jubatus'') also known as the northern sea lion and Steller's sea lion, is a near threatened species of sea lions in the northern Pacific. It is the sole member of the genus ''Eumetopias'' and the largest of the eared seals (Otariidae). Among pinnipeds, it is inferior in size only to the walrus and the two elephant seals. The species is named for the naturalist Georg Wilhelm Steller, who first described them in 1741. The Steller sea lion has attracted considerable attention in recent decades due to significant, unexplained declines in their numbers over a large portion of their range in Alaska.
== Description ==
Adult animals are lighter in color than most sea lions, ranging from pale yellow to tawny and occasionally reddish. Steller sea lion pups are born almost black, weighing around , and remain dark for several months. Females and males both grow rapidly until the fifth year, after which female growth slows considerably. Adult females measure in length, with an average of , and weigh , with an average of .〔(Steller Sea Lions, Eumetopias jubatus ). marinebio.org〕〔(Steller Sea Lions ). Northwest Regional Office. noaa.gov〕 Males continue to grow until their secondary sexual traits appear in their fifth to eighth year. Males are slightly longer than the females; they grow to about long, with an average of . Males have much wider chests, necks, and general forebody structure and weigh , with an average of .〔(Eumetopias jubatus. Steller sea lion ). Animal Diversity
〕〔Peter F Olesiuk and Michael A. Bigg (Marine mammals in British Columbia ). (~1984)〕 Males are further distinguished from females by broader, higher foreheads, flatter snouts, and darker, slightly tuftier hair around their large necks, giving them a maned appearance. Indeed, their Latin name translates roughly as "maned one with the broad forehead".
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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