animal boundary domesticated farm fence field livestock mammal meadow old Pembrokeshire run sheep shorn stone traditional wales wall welsh fleece lamb animals grass graze grazing Great Britain mammals nature black Buckinghamshire England english faced green head pastoral spring trees white agricultural appearance appearances bare bared black-and-white blackfaced-sheep domestic ewe farm-animal farming features quiet shadow shearing texture wool woolly countryside flock hill landscape natural panorama rural South Downs summer Sussex view