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High virus levels in birds like blue-winged teal, ducks that migrate long distances, helped spread the virus to new parts of South America, Stallknecht said.

By mid-January, the virus had infected an American wigeon and blue-winged teal in South Carolina, according to the U.S.

The affected species include black-bellied whistling ducks, blue-winged teal and a variety of egrets.

With the 1941 edition of “A Field Guide to Western Birds” in his pocket, he found a bufflehead duck, mallard and blue-winged teal on the Laramie Plains lakes.

Another day, a small flock of blue-winged teal, hellbent for the tropics, strafed across my bow.