Rare self-rolling giant snow balls found in UK - 10th Jan 2010 10:58pm
They may look like winter's answer to crop circles, but these mysterious snow rolls are in fact a rare natural phenomenon usually found only in the world's most remote and frozen regions.
Also known as snowrollers, snow bales and snow doughnuts, they form mostly in unusual conditions created by a precise combination of snow, ice, wind, temperature and moisture on the prairies of North America.
But this week's frozen weather has allowed the snow cylinders to make a freak appearance in the UK.
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