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The Baikal seal, Lake Baikal seal or ''nerpa'' (''Pusa sibirica''), is a species of earless seal endemic to Lake Baikal in Siberia, Russia. Like the Caspian seal, it is related to the Arctic ringed seal. The Baikal seal is one of the smallest true seals and the only exclusively freshwater pinniped species.〔Randall R. Reeves, Brent S. Stewart, Phillip J. clapham, James A. Powell, ''"National Audubon Society Guide to the Marine Mammals of the World"'', Alfred A. Knopf publishing, New York, 2002〕 A subpopulation of inland harbour seals living in the Hudson's Bay region of Quebec, Canada (''lac de loups marins'' harbour seals), the Saimaa ringed seal (a ringed seal subspecies) and the Ladoga seal (a ringed seal subspecies) are found in fresh water, but these are part of species that also have marine populations.〔 It remains a scientific mystery how the seals originally came to Lake Baikal, hundreds of kilometers from any ocean. The most recent population estimates are 80,000-100,000 animals, roughly equaling the expected carrying capacity of the lake.〔 At present, the species is not considered threatened, despite hunting (both legal and illegal) and heavy pollution of the lake.〔 ==Statistics== * Weight: average, maximum * Length: average * Food: mainly Baikal oilfish〔 * Litter: usually one pup, sometimes two〔 * Diving time: usually 20–25 min (45–70 min maximum) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Baikal seal」の詳細全文を読む スポンサード リンク
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