A new study points to large frog migrations occurring days prior to major deadly earthquakes.
A plague of frogs and fears of a possible seismic disaster have been added to the economic and political anxieties Greek residents have endured in recent weeks.
Millions of the amphibians have hopped across the Egnatia highway in the north of the country, forcing its closure after three cars skidded while trying to dodge the green invaders.
Biologists say the frogs could have migrated en masse from a nearby lake in search of food.
But some believe the frog movement could portend a powerful earthquake.
British scientists released a report in April that documented such mass frog migrations before the April 2009 Italian quake that killed more than 300 people.
Millions of frogs began relocating in central China during 2008, just seven days before a powerful quake killed 12,000.
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