THE EARTH
Where the Xerces Blue Butterfly Was Lost, Its Closest Relative Is Now Filling In
Apr 16, 2024
More than 80 years after the iconic Xerces Blue butterfly vanished from San Francisco, researchers have analyzed century-old specimens to track down its closest living relative, the Silvery Blue. Last week, they released a handful of Silvery Blues on the western edge of the city, where Xerces Blues once thrived.