The Southern Pomo have lived for thousands of years in parts of Sonoma and Mendocino counties, including Windsor. They called the eastern part of Windsor col·iko wi, meaning "at redwing field," after the redwing blackbirds found there. They built several kinds of dwellings, including single-family and multi-family houses made by thatching willow frameworks with tall native bunchgrass stalks, and they used earth-covered, semi-subterranean roundhouses for religious ceremonies; these structures are still used by the Pomo today. Among the Southern Pomo groups, the Makahmo Pomo recognized seasons in a way reflected by a calendar with three names for different aspects of spring and two names for fall. Southern Pomo baskets served many everyday purposes, including trapping fish and birds, gathering, processing, and storing plant foods, cradling babies, and providing mortuary offerings. They also used heated stones to boil food in finely woven, watertight cooking baskets, and they carefully tended basket-making plants such as willow, bulrush, sedge, and redbud with specialized burning, digging, and pruning techniques. Baskets made by Windsor Pomo weavers are in the Smithsonian collection in Washington D.C.