The California Academy of Sciences is leading an effort to bring back the Xerces blue butterfly, which went extinct around ...

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 ...

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.

There’s good news tonight for a team in Presidio National Park, working to introduce Silvery Blue butterflies to the ecosystem to act as crucial pollinators. The butterflies are close genetic ...

Dozens of silvery blue butterflies have been released at the Presidio National Park in San Francisco, Calif., to fill the ecological gap left by the Xerces blue butterfly, a native species last ...

The Palos Verdes blue butterfly is so small and so blue — the kind of deep sky-blue that makes people exclaim, “What a beautiful day!” — that it looks more like jewelry than a living creature.

The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in California this winter, a foreboding sign for the future of the beloved ...