A plague of frogs and fears of a possible earthquake have added further uncertainty to the economic and political anxieties that Greek residents have endured in recent weeks. Biologists say the frogs could have migrated en masse from a nearby lake in search of food. But some believe the frog movement could hint at 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 also began relocating in central China during 2008, just seven days before a powerful quake killed 12,000.
