According to the American scientist G. Collins, a group of people moved down the river Nushagak River, which is about 13 thousand years ago, flowed around the Pribilof Islands in the Bering Sea (the outline of which, of course, were different than they are now). "Following in the valley of the river, they got into the territory of the peninsula between the glaciers of Alaska and the Alaska Range, rich in fish and game. Production of salmon as the main power source was a continuation of the ancient practice of river and coastal tribes in the region between the Amur and Anadyr - says N. Coast in the "ancient cultural traditions of the American Arctic and their relationship with the North-East of Siberia." - Next, the first immigrants gradually spread to the south, moving along the foothills and the hills of Alaska, and western Canada, penetrating the area of ??tundra in the cold prairie after the large herbivores. "