More than eight decades ago, a mesmerizing butterfly with iridescent cobalt wings and stunning spots called the Xerces blue vanished from San Francisco. When it disappeared, the Xerces became ...

The insect, the Xerces blue butterfly, died out in the mid-20th century as a result of pronounced habitat loss, according to the Florida Museum of Natural History. Its extinction raised awareness ...

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 Xerces Blue butterfly (Glaucopsyche xerces) was native to the coastal dunes of San Francisco, in the United States. As the city grew, much of the butterfly’s habitat was destroyed and its ...

the Xerces blue (Glaucopsyche xerces) is a beautiful butterfly. The tips of its wings, covered in soft down, are outlined in black with an intricate pattern of spots on their undersides. And the core ...

New research suggests the iconic Xerces blue butterfly may have been its own species. By Sabrina Imbler More than a century ago, a bluish butterfly flitted among the sand dunes of the Sunset ...

This 93-year-old Xerces blue butterfly specimen was used in a study to prove it was once a unique species. (Courtesy Field Museum) Monarch butterflies are in steep decline. Numbering some 1.2 ...