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various tools made of the bones, antlers, and tusks of animals. They are known from the Paleolithic period. In the Upper Paleolithic, spearheads, dart tips, needles, chisels, awls, and daggers were made from bone; in the Neolithic, bone also came to be used for arrowheads, harpoons, fishhooks, hoes, parts of bows, and planes (tools for cleaning hides). Bone tools were also widely used in the early Iron Age, for example, among tribes of the D’iakovo culture. With the development of metal-working, bone tools were gradually replaced by metal tools. Among some peoples, especially the land and sea hunters of the North (Eskimo, Chukchi, Koriak), the use of bone tools continued until the 17th through 19th centuries.