セミクジラ
Past thinking about North Pacific right whale migration presumed a paradigm of migratory behavior similar to that of other baleen whales in the North Pacific. Perhaps the extreme example of North Pacific whale migration is that of Gray whale. Nearly all the Gray whales that summer in the Bering Sea migrate to wintering grounds off Baja California. In summer and winter, nearly all the gray whales are either at the northern or southern ends of their range. Initially scientists assumed that North Pacific right whales had similar migratory pattern.