Bandelier states that the Pimas “dwelt in scattered hamlets, the houses of which combine to-day the mud roof of a typical New Mexican pueblo with the temporary framework of frail branches characteristic of the roaming savage.”[171] The roof is dome-shaped, but it is similar in material to the Pueblo mud roof, so that there we have a sort of a cross between the Moki field shelter, already mentioned, and the Navajo hut or hogan. The stock from which the present Pimas descended are supposed to have built the remarkable structure in Arizona known as _Casa Grande_, found in ruins by the first explorers. Tribes alter their methods of building, either from summer to winter or at different epochs. The Omahas at one time made lodges of wood, at another of earth, and at still another time they dwelt in tipis of skin. If a stone-house-building tribe should migrate to a region where neither loose flat stones nor adobe clay could be readily obtained, they would be forced to use timber.[172] The Zuñi languages and traditions point to the occupancy by the Pueblos in early times of brush houses like those of the Pai Utes. The Mohaves live in low huts of branches covered with mud. The communal principle of living pervaded America and largely determined the size and character of the dwellings. A number of families usually lived together, in the same house, or in a group of rooms or houses. The “long-house” of the Iroquois, called by them _hodénosote_, and the clustered fortress-houses of the Pueblos, are good examples of the results of the practice of the communal principles adhered to by most of the Amerinds. It is also believed by some of the best authorities, like Bandelier and Morgan, that the Mexican and Mayan houses were largely due to the same cause.