The first insectile casualty of human activity in the United States was recorded around 80 years ago, new research has confirmed. The insect, the Xerces blue butterfly, died out in the mid-20th ...

(CN) — The Xerces blue butterfly was last seen in the early 1940s in San Francisco. The small, iridescent blue insect, originally discovered in 1852, was endemic to and once plentiful among the ...

It’s been roughly 80 years since the Xerces blue butterfly was last spotted flitting about on pastel wings across coastal California sand dunes. But scientists are still learning about the insect. The ...