Exclosure

An exclosure, in an area being used extensively for grazing, is a limited area from which unwanted animals, for example browsing animals, such as domestic cattle or wildlife, such as deer, are excluded by fencing or other means. Exclosures are sometimes constructed by government agencies that manage livestock use on public lands—a practice in which private owners of cattle pay, though often only a nominal sum, for the right to graze their livestock on the public lands.