In the nineteenth century, the Eastern Shoshone had a complex pattern of land use. The Buffalo Eaters did not have a single set of specified boundaries, but a number of different ones of varying significance. The valleys of the Green and Wind rivers were their core area, with the plains and Mountains used at times. They had a pattern of annual movements with concurrent tribal concentrations and dispersals. The Mountain Sheep Eaters held the central Rocky Mountain Region but also had reciprocal relations with the Buffalo Eaters. In the early days, the dwellings were bison-skin tipis. The tipis' pole framework was covered by a complex arrangement of bison hides, and the covering was decorated with paintings celebrating the husband's accomplishments. Small menstrual huts were also used. Dwellings on the reservation today are generally wooden bungalows.