Reindeer herding is probably the most important source of livelihood for the Nenets. While the forest Nenets living in the taiga keep only a small number of reindeer, the largely treeless northern tundra areas are ideal for long-distance migrations with larger herds. Unlike other groups in northeastern Siberia, the Nenets also use reindeer teams for transportation in the summer, with the sleds gliding over the slippery ground. Their sleds also differ from those used in other areas of Siberia. A drill is useful for repairs that often need to be carried out during migrations. However, one of the most important tools is a lasso made from animal skins with a special eyelet to form a tightening loop.