The impact of sheep is under estimated. On Dartmoor in the UK sheep roam freely and there are very few trees. However, there are pockets of fenced areas that ar

The impact of sheep is under estimated. On Dartmoor in the UK sheep roam freely and there are very few trees. However, there are pockets of fenced areas that are thickly grown with upland oak and ash that would have presumably been what the whole moor would have had.