the Americas reached North America before the ancestors of the Eskimo and Aleut. There appear to have been several waves of migration from Siberia to the Americas by way of the Bering land bridge, which became exposed between 20,000 and 8,000 years ago during periods of glaciation. By about 3,000 years ago, the progenitors of the Yupiit had settled along the coastal areas of what would become western Alaska, with migrations up the coastal rivers— notably the Yukon and Kuskokwim— around 1400 AD, eventually reaching as far upriver as Paimiut on the Yukon and Crow Village on the Kuskokwim. The Siberian Yupik may represent a back-migration of the Eskimo people to Siberia from Alaska. Culture Traditionally, families spent the spring and summer at fish camp, then joined others at village sites for the winter. Many families still harvest the traditional subsistence resources, especially Pacific salmon and seal. The men's communal house, the qasgiq, was the community center for ceremonies and festivals that included singing, dancing, and storytelling. The qasgiq was used mainly during the winter months because people would travel in family groups following food sources throughout the spring, summer, and fall months. Aside from ceremonies and festivals, the qasgiq was also where the men taught the young boys survival and hunting skills, as well as other life lessons. The young boys were also taught how to make tools and qayaq (kayaks) during the winter months in the qasgiq. The ceremonies involve a shaman. The women's house, the ena, was traditionally right next door. In some areas, the two communal houses were connected by a tunnel. Women taught the young girls how to tan hides and sew, process and cook game and fish, and weave. Boys would live with their mothers until they were approximately five years old, then they would join the men in the qasgiq. For a period varying between three and six weeks, the boys and girls would switch cultural educational situations, with the men teaching the girls survival, hunting skills, and toolmaking, and the women teaching the boys the skills they taught to the girls. In Yup'ik group dances, individuals often remain stationary while moving their upper body and arms rhythmically, their gestures accentuated by handheld dance fans, very similar in design to Cherokee dance fans. The limited motion by no means limits the expressiveness of the dances, which can be gracefully flowing, bursting with energy,