The Dyke

I went for a wander in the garden at work again this morning and came across these dry stain dykes (unmortared stone walls),covered in moss. It got me wondering how old they were and who built them? The skill it took to painstakingly piece together the correct sized stones is a dying art sadly.
We still have the old farmhouse on the property (though I have been unable to find out much info about it, even though I did live there briefly), and in its day it must have had an amazing view over the land as it sits at the edge of the hill overlooking the valley towards the Campsies. These dykes may have kept the sheep at bay or hemmed in the fields and vegetation, but they are no defense against the deer, as they still hop over them with ease to graze in the garden.
I think Spring may really be around the corner:)