Northern fur seals breed on islands near Russia, Alaska, and California, but not necessarily on the island where they were born females tagged as pups have been found breeding on other islands. The seals range widely in the North Pacific, some swimming as far south as the US-Mexican border, and in the western Pacific, as far south as southern Japan. Learn more about the Callorhinus ursinus, more commonly known as a Northern Fur Seal, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.