I have asked around everywhere and no one has ever heard of lambs sleeping on their mother's backs.  On our farm, when it is resting time, our baby lambs jump on their mother's backs, make a little nest by padding down the wool and then curl up snug as a lamb-in-a-rug.  The only explanation I have is that it is a normal thing.  Sheep in Norway are shorn in Autumn and Spring and so ewes have no wool on them by the time they lamb.  We don't shear our sheep.  They need to kept their wool on for the winter because they are outside, not in a barn.  Come lambing season and our sheep still have a fuzz of wool.  What better, safer place, for a lamb than on its mother's back?  This is the natural way of Gammelnorsk spæl sau. We do have one sheep that has fully lost all her woolly coat.  She just so happens to be the only one who wasn't pregnant and had no lambs.  It is likely that she shed her wool early because she didn't need it for lambs this season. 

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