Bird watchers walking along the beach on the Baltic island of Öland off Sweden’s southeastern coast were puzzled by an unusual natural phenomenon recently when they stumbled across dozens of football-sized balls of ice lying on the shore.
A week before Christmas, Magnus Bladh of the Ottenby bird station, located on Öland’s southern cape, was strolling along the beach with a colleague when he saw something he’d never seen before.
“Temperatures were below freezing and there was a light wind, but it was very cold! In the seaweed we noticed at least 200 large ice balls,” he said in a report to Swedish meteorological agency SMHI.
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