One of the main features of the economy of the mountains is the practice of vertical transhumance, which means progressively moving the cattle, throughout the year, from the fields on the valley floor to the mid-altitude pastures and then to those at high altitude, where the grazing areas are located. The dwellings in these areas are made up of two main zones: a two-storey building, with basement or small stable at round level, dwelling and milk production on the first floor; and another building next to the first, much longer and only one floor, occupied by stables.