Wall walkers

This just HAD to be my blip today!
I came home from shopping today and low and behold, two sheep quite happily walking along the top of our dry stone wall eating the tops of our trees. Is it any wonder that the trees don't grow well here! You build a wall to keep the sheep and rabbits out and they decide its a great vantage point! One of the sheep jumped down into the garden side of the wall so I shouted at it and it quite happily just went back over the wall! I guess it would be about four foot high at the bit it went over. I think we may be fighting a losing battle!