A mysterious disease that's killing bald eagles along the Wisconsin River continues to puzzle wildlife experts.
Scientists say the disease is now known as Wisconsin River eagle syndrome. It causes the birds to have seizures. And wildlife biologists say it appears to be unique to the river valley and the Sauk City and Prairie du Sac area.
Joe Kelley is a Sauk City veterinarian who helps monitor the disease. Kelley worries about the spread of the disease with hundreds of eagles gathering along the river during their winter sojourn.
He says there's no connection between the disease and a significant drop in the number of eagles along the river this winter. Weather conditions and a possibly a lack of food are thought to be reasons the population dropped from a record 614 birds in 2004 to about 117 this winter.