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
Vladimir Rusanov Ocean via the Northern Sea Route. Their ship "Gerkules" was too small for the kind of expedition Rusanov had in mind. The last to be heard of Rusanov's expedition was a telegram left at Matochkin Shar on Novaya Zemlya, which reached St. Petersburg on 27 September 1912. In it, Rusanov indicated that he intended rounding the northern tip of Novaya Zemlya, and heading east across the Kara Sea but nothing was heard from the "Gerkules" thereafter. He and his 11-man team, including Alexander Kuchin, disappeared without trace a year later in the Kara Sea, off the northern coast of Siberia.