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
Belushya Guba area of restricted access (formally, as part of border security zone), and a special permit is needed to visit the archipelago. About northeast of Belushya Guba is the settlement of Rogachevo, the second largest in the archipelago, along with the Rogachevo airbase. Upon visiting Novaya Zemlya in 1894, Arkhangelsk Governor decided to create a new encampment. In 1896, an expedition conducted a survey of the west coast of Novaya Zemlya. The following year Belushya Guba was founded. During World War II, Belushya Guba was a focus of both German and Soviet attention. German U-boats used Belushya Bay as a resting