Virus Causing Mass Duck Die-Offs on Cape Cod Identified

Since 1998, hundreds and sometimes thousands of dead eider ducks have been washing up every year on Cape Cod's beaches in late summer or early fall, but the reasons behind these cyclic die-offs have remained a mystery. A team of scientists from Cornell, Tufts University, University of Georgia, the U.S. Geological Survey and the U.S. Fish and Wildlife Service have pinned down one of the agents responsible: a pathogen they're calling Wellfleet Bay virus (WFBV). Their findings shed light on why eider ducks (also called common eiders) die on Cape Cod every year and offer hints about how the virus spreads.

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