...and let it lead you to Santa with your wishlist:
http://www.telegraph.co.uk/news/newstopics/howaboutthat/2623809/Cows-point-north-thanks-to-in-built-compasses.html
But seriously, the reason why cows point their head north might be that wind from north is cooler than wind from south, and then they avoid in larger degree udder (and bladder or uterus) infection if their udder and other vulnerable parts nearby is protected from cold wind. Combining that with daylight and the tendency of facing north is preferred through evolution.
Mystery solved?
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