Siberian fur trade to overhunting. Instead of one sable pelt, the following was accepted as its equivalent: one fox, glutton (relative of the marten), or otter pelt; two blue-fox pelts; sixteen polar-fox pelts; or one hundred squirrel pelts. The Russian government decided the amount of other pelts that were equivalent to the sable pelt. Within forty years, almost all Siberian natives were forced into paying fur tribute to the Russians. Russian traders, hunters, and explorers reached the Pacific coastline by 1650 and were collecting fur tribute from most natives along the coast. Beyond the yasuk, the Russians had two principal ways of obtaining
Northern goshawk at is the smallest marten and is sometimes taken as prey by the goshawks, successfully ambushed and preyed on a brooding female goshawk. In Chequamegon-Nicolet National Forest of Wisconsin, the main source of mortality for northern goshawks is reintroduced fishers ("Martes pennanti"), which are the largest kind of marten at and capably kill many chicks, fledglings and brooding females. In contrast, in Europe, the pine marten ("Martes martes") has only been known to prey on young goshawks still in the nest and not adults. Other mammals capable of climbing trees have been observed or inferred to predate goshawks, either mostly