animals cloud domesticated England english farm field graze Great Britain green hill lambs landscape mammals meadow pastoral peace sheep sky South Downs spring Sussex trees valley track fence animal hills lamb livestock mammal national park natural nature rural storm view flock grass meadowmfield panorama blue cattle clouds countryside cows horns peaceful sit stand summer tranquil Chordata ear fleece fresh head herbivore leg nose ovis pasture tail white Brecon Beacons changeable fey fickle mountains sunlight united kingdom wales welsh footpath mountain trail walk contented cow herd slope