Franz Josef Land and snow bunting. Some ivory gulls, little auks and Brünnich's guillemots opt to spend the winter on the islands. The polar bear population of Franz Josef Land lies within the Barents Sea subpopulation, which also includes polar bears inhabiting Svalbard and the western coast of Novaya Zemlya. In 2004, the Barents Sea subpopulation was estimated at 2,650. There is also a population of Arctic fox, which typically have their territories near seabird habitats. Being declared as a marine mammal sanctuary, the island has rich biodiversity of rare marine mammals. Three species of seals habit the archipelago. Harp seal is the
Franz Josef Land most common, although it breeds in the White Sea. Slightly less common is the bearded seal. Walruses were previously hunted, dramatically reducing the formerly abundant species. They have been internationally protected since 1952 and their numbers have since been on the rise, with between one and three thousand walruses living in the archipelago. The population is common with Svalbard and northern Novaya Zemlya. Minke whales, humpback whale, and beluga whales are commonly seen around the island, and less commonly orcas and narwhales, with the archipelago being located on the northern edge of their summer range. Fin whales were newly confirmed