The Inuit's cold-adapted culture did not reach a state of near- perfection until the arrival of the Thule-culture people, who moved eastward from Alaska about A.D. 800, and within less than 200 years spread across most of the North American Arctic, displacing or absorbing the Dorset people. 

Superb sea-mammal hunters, Thule-culture Inuit pursued and killed everything, from the small ringed seal to the giant bowhead whale, and, according to archaeologist Robert McGhee of the Canadian Museum of Civilization, they had evolved "a technology more complex than that of any other preindustrial society, which allowed not only an economically efficient but also comfortable way of life throughout arctic North America."

 The Thule Inuit invented, perfected, and passed on to Inuit of historic times such a plethora of specialized tools and hunting equipment that the late James A. Ford of the American Museum of Natural History described them as "gadget burdened. 

The tool kit, for instance, used by Inuit not long ago to hunt seals at their agloos, the snow-covered breathing holes through the ice, consisted of about forty items, from the thin, slightly curved bone probe to determine the shape of the agloo, to tutereark, the piece of thick caribou winter fur on which the hunter stood so that no sound would warn the seal of his presence. 

The Inuit achieved this broad-ranging yet highly specialized Arctic material culture against what seem insuperable odds. Not only was their land exceedingly cold, hostile, and barren, it was also poor in those raw materials most societies have found essential. Metal was rare: meteoric iron, brittle and hard to work, was found in the Cape York region of northwest Greenland, and native copper in a few areas of the central Canadian Arctic. Driftwood was abundant along Alaska's coast and east past the Mackenzie River delta; it was rare in the eastern Arctic and virtually nonexistent in the central Arctic. That left stone, ice, snow, and sod as the most readily available and most widely used materials that the land and the sea provided. Infinitely more important were the materials they obtained from the animals they killed: bone, horn, baleen, antlers, teeth, ivory, furs, skins, sinews, and intestinal tissues.