Over 1,000 Mallard Ducks Die in Idaho

More than 1,000 mallard ducks have died along a single creek in southern Idaho, and officials on Wednesday tested tissue samples to find out why.

The symptoms _ lesions in the lungs and hemorrhaging in the heart wall _ likely point to a bacterial infection, not avian flu, said Dave Parrish, regional supervisor for the Idaho Department of Fish and Game.

State wildlife biologists and U.S. Department of Homeland Security investigators were not ruling out any cause of death.