Self rolling snowballs!

[Puggit]

Crop circles are so last year.

Daily Telegraph

Telegraph said:

Rare self-rolling giant snow balls found in UK
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.

(more in the link)

[GTIR]

Stranger still is the same thing happens to big boulders in the desert - ice moves them along for miles.

[10 Pence Short]

All the fields around me in the Eden Valley had these in them last week.

[Neil H]

I think it's the snowmen who do it.

[ayu]

Wow,,, big Unko! Who did it??