Fur trade marten furs could generate in international markets spurred a "fur fever" in which many Russians moved to Siberia as independent trappers. From 1585 to 1680, tens of thousands of sable and other valuable pelts were obtained in Siberia each year. The primary way for the Muscovite state to obtain furs was by exacting a fur tribute from the Siberian natives, called a "yasak". "Yasak" was usually a fixed number of sable pelts which every male tribe member who was at least fifteen years old had to supply to Russian officials. Officials enforced "yasak" through coercion and by taking hostages, usually
Mount Ilgaz National Park ("Vulpes vulpes"), wildcat ("Felis silvestris"), lynx, European pine marten ("Martes martes"), beech marten ("Martes foina"), weasel, rabbit, squirrel, hedgehog, mole, bat, European badger ("Meles meles") and European otter ("Lutra lutra"). Studies showed the existence of 617 taxa in and around the national park. Mount Ilgaz National Park offers opportunities for diverse outdoor sports including hiking, camping and caravaning as well as daily activities. Angling at fishponds situated on Karasu stream in Baldıran Valley is possible between June 15 and September 15. Visitors can also buy trout throughout the year from fish hatcheries in the same area. Another important feature of