West Nile virus is still here, and it has killed millions of U.S. birds

The virus, also deadly to humans and intensified by climate change, continues to spread among birds.

A male ruffed grouse struts its stuff in a courtship display seen in Fairbanks, Alaska. Scientists say the species is declining fast because of a combination of West Nile virus, climate change, and loss of habitat.
Photograph by DESIGN PICS INC, Nat Geo Image Collection

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