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anatomical fact of a narrower pelvis, but not so unreasonable. Ergaster's brain was only slightly larger, in relation to body size, than that of habilis, its assumed predecessor, but it was nonetheless capable of a whole new level of stone tool-making. The more sophisticated tool kit, called the Acheulean Industrial Tradition, included the lozenge-shaped stones thought to be hand axes, although their precise use is not known for sure, as well as cleavers and other large tools. From the microscopic pieces of material on the stones, as well as modern experiments in stone knapping, the tools seem to have been designed for a wide array of tasks, such as heavy and light duty butchering, slitting hides, breaking bones, cutting grass, and woodworking. Ergaster doubtless used many tools and materials made of wood and other perishable substances.

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