Travel back 20,000 years into the last Ice Age, to a time when the upper reaches of the Blue Mountains were treeless and the ...

Blue butterflies return to San Francisco Presidio, 80 years after Xerces species extinction. The California Academy of Sciences used genetic testing to identify a blue butterfly species similar to ...

KTVU FOX 2 San Francisco. Blue butterflies return to San Francisco Presidio, 80 years after Xerces species extinction. Posted: March 21, 2025 | Last updated: March 21, 2025 ...

The Xerces blue butterfly vanished from San Francisco in the 1940s. Scientists just released dozens of butterflies from a related species to take its place.

The Xerces blue butterfly, which serves as both pollinator and prey in the ecosystem, has been extinct since 1943. So scientists identified the species' closest living relative, the silvery blue ...

SAN FRANCISCO — More than 80 years ago, a beautiful butterfly called Xerces blue that once fluttered among San Francisco’s coastal dunes went extinct as stately homes, museums and parks ate up ...

Biologist Durrell Kapan, Ph.D. of the California Academy of Sciences says the butterflies will be replacing a long-lost species called the Xerces Blue that went extinct in the 1940s.

In 1943, the gossamer-winged Xerces blue butterfly disappeared from San Francisco as housing, parks and museums completely wiped out its habitat in what is now the Richmond and the Sunset.

SAN FRANCISCO — More than 80 years ago, a beautiful butterfly called Xerces Blue that once fluttered among San Francisco’s coastal dunes went extinct as stately homes, museums and parks ate up ...

SAN FRANCISCO (AP) — More than 80 years ago, a beautiful butterfly called Xerces Blue that once fluttered among San Francisco's coastal dunes went extinct as stately homes, museums and parks ate ...