The fur seals of the North Pacific comprise three distinct herds, which do not intermingle in any way, having distinct breeding grounds, feeding grounds, and routes of migration. By far the most important of the three herds is that which resorts to the American Pribilof Islands. This herd breeds upon the islands of St Paul and St George during the summer, and in winter passes down through the channels of the Aleutian Islands into the Pacific Ocean. The migration reaches as far south as the coast of southern California and returns along the west coast of North America. The next herd in importance is that resorting to the Russian Komandorski (Commander) Islands. This breeds upon the islands of Beringa and Medni, passing in winter down along the eastern coast of Japan and returning by the same route. The third herd is resident in the Sea of Okhotsk on the Japanese Robben (Kaihyoto) Island, where a considerable remnant still exists. It formerly occupied other rookeries on four islands of the Japanese (formerly Russian) Kuril (Chishimi) group, but these are now virtually extinct. The migration route of this herd lies in the inland sea of Japan.
The fur seals and fur-seal islands of the North Pacific ocean. By David Starr Jordan ... commissioner in charge of fur-seal investigations of 1896-97. With the following official associates: Leonhard Stejneger and Frederic A. Lucas of the U.S. National Museum. Je